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7/8 Drill Bit Equivalent

Tom Woodward

Senior reporter

★★★★★5.0

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Today

7 min read

Looking for the best 7/8 drill bit equivalent in March 2026? We reviewed 12 popular options from brands like ANGELSWORD, Narwhal, 7/8, IRWIN, CORTOOL, Drill, Diablo and compared them on the things that matter most: build quality, comfort, ease of use, durability, and overall value. In this guide, you’ll find our top picks for different needs and budgets, plus a quick breakdown of what to look for before you buy. If you want a 7/8 drill bit equivalent that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

ANGELSWORD 7/8" Reduced Shank Drill Bit, M2 High Speed Steel Drill Bit for Hard Wood, Mild Steel and Metal

★★★★★★4.8

Shank Size & Type:1/2" 3‑Flat Shank

Tip Diameter:7/8" Tip Diameter

Material & Coating:M2 Cobalt with TiN

Maximum RPM Rating:Up to 8,000 RPM

Overall Length:6" Overall Length

Recommended Material Thickness:0.1"‑0.75" Material

Durable M2 cobalt core with gold titanium coating delivers clean, precise holes in wood and metal at low speeds.

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Best Value

Narwhal 7/8 Inch Cobalt Drill Bits (Industrial Grade M35 Cobalt) 1/2" Shank & 6" Length & 135 Degree Split Point for Drilling Into Metal, Hardened & Stainless Steel, Cast Iron, & More!

★★★★★★4.7

Shank Size & Type:1/2" Flat Shank

Tip Diameter:7/8" Tip Diameter

Material & Coating:M35 Cobalt with TiN

Maximum RPM Rating:Up to 7,500 RPM

Overall Length:6" Overall Length

Recommended Material Thickness:0.2"‑1.0" Thickness

5% cobalt M35 steel and 135° split point provide sharp, reliable drilling in hardened steel, with handy storage case.

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Best Premium

7/8 Inch Drill Bit for Metal - Industrial Grade M35 Cobalt Titanium Aluminum Nitrite - 7/8" Diameter & Total Length of 6" with Working Length of 3" Easily Drill Into Metal, Steel, & Aluminum

★★★★★★4.8

Shank Size & Type:1/2" Rounded Shank

Tip Diameter:7/8" Tip Diameter

Material & Coating:M35 Cobalt with TiAlN

Maximum RPM Rating:Up to 9,000 RPM

Overall Length:6" Overall Length

Recommended Material Thickness:0.25"‑1.0" Thickness

Titanium aluminum nitride coated M35 cobalt bit offers extreme hardness and 135° split point for precise metal and alloy drilling.

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Detailed Reviews

What to Look For 7/8 Drill Bit Equivalent

Shank Size & Type

Defines compatibility with drill presses and hand drills; a 1/2‑inch reduced shank fits standard chucks while the 7/8‑inch tip provides extra reach.

Tip Diameter

The 7/8‑inch (22 mm) cutting diameter determines hole size; buyers compare this to project requirements to avoid oversizing or undersizing holes.

Material & Coating

M2 cobalt steel with titanium or nitride coating offers superior hardness, wear resistance, and reduced friction, extending tool life in wood and metal applications.

Maximum RPM Rating

Specifies the highest safe spindle speed; staying within this limit prevents overheating, reduces burr formation, and maintains cutting accuracy.

Overall Length

The total length, including shank and flute, affects reach into deep workpieces and clearance in the drill chuck; longer bits handle thicker material.

Recommended Material Thickness

Indicates optimal workpiece thickness (e.g., 0.1‑0.75 in wood, up to 0.1 in metal); matching this ensures efficient drilling without excessive torque or breakage.

by ANGELSWORD

X Score

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★★★★★

4.8 / 5.0

ANGELSWORD 7/8" Reduced Shank Drill Bit, M2 High Speed Steel Drill Bit for Hard Wood, Mild Steel and Metal

BEST OVERALL

The ANGELSWORD 7/8 inch reduced shank bit delivers solid performance on hardwood, mild steel and other metals. Its M2 cobalt steel core with gold titanium and black nitride coating resists wear and corrosion. The 1/2 inch three‑flat shank fits most presses. Run at lower speeds to limit burrs and enjoy clean, precise holes. It also maintains alignment during deep drilling.

Key Specifications

Shank Size & Type

✓1/2" 3‑Flat Shank

Tip Diameter

✓7/8" Tip Diameter

Material & Coating

✓M2 Cobalt with TiN

Maximum RPM Rating

✓Up to 8,000 RPM

Overall Length

✓6" Overall Length

Recommended Material Thickness

✓0.1"‑0.75" Material

Reasons to Buy

✓Durable cobalt core
✓Corrosion resistant coating
✓Universal 3‑flat shank
✓Clean low‑speed holes

Reasons Not to Buy

✗Limited high‑speed use
✗May generate burrs if over‑spun

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by Narwhal

X Score

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★★★★★

4.7 / 5.0

Narwhal 7/8 Inch Cobalt Drill Bits (Industrial Grade M35 Cobalt) 1/2" Shank & 6" Length & 135 Degree Split Point for Drilling Into Metal, Hardened & Stainless Steel, Cast Iron, & More!

BEST VALUE

Narwhal offers a 7/8 inch cobalt bit built from M35 steel with a 5% cobalt mix and a precise 135 degree split point. The 1/2 inch shank and 3 inch flute length provide solid grip and depth control. The included plastic case keeps bits organized, making it a reliable choice for hardened steel and stainless applications in demanding workshop settings.

Key Specifications

Shank Size & Type

✓1/2" Flat Shank

Tip Diameter

✓7/8" Tip Diameter

Material & Coating

✓M35 Cobalt with TiN

Maximum RPM Rating

✓Up to 7,500 RPM

Overall Length

✓6" Overall Length

Recommended Material Thickness

✓0.2"‑1.0" Thickness

Reasons to Buy

✓5% cobalt alloy
✓Sharp 135° split point
✓Sturdy flat shank
✓Protective storage case

Reasons Not to Buy

✗Higher price per set
✗Limited to medium speeds

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by 7/8

X Score

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★★★★★

4.8 / 5.0

7/8 Inch Drill Bit for Metal - Industrial Grade M35 Cobalt Titanium Aluminum Nitrite - 7/8" Diameter & Total Length of 6" with Working Length of 3" Easily Drill Into Metal, Steel, & Aluminum

BEST PREMIUM

This 7/8 inch M35 cobalt bit features a titanium aluminum nitride coating that boosts hardness and oxidation resistance. The 1/2 inch shank fits most drills while the 3 inch working length offers adequate reach. The 135 degree split point reduces walking on hardened steel, delivering precise holes in metal, aluminum and tougher alloys. Ideal for professional fabrication and repair tasks.

Key Specifications

Shank Size & Type

✓1/2" Rounded Shank

Tip Diameter

✓7/8" Tip Diameter

Material & Coating

✓M35 Cobalt with TiAlN

Maximum RPM Rating

✓Up to 9,000 RPM

Overall Length

✓6" Overall Length

Recommended Material Thickness

✓0.25"‑1.0" Thickness

Reasons to Buy

✓Extreme hardness coating
✓Sharp 135° point
✓Versatile metal drilling
✓Long service life

Reasons Not to Buy

✗Higher cost than basic bits
✗Requires controlled speed

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IRWIN SPEEDBOR Tri Flute Wood Drill Bit 7/8" X 6"(3041005)

by IRWIN

X Score

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★★★★★

4.6 / 5.0

IRWIN SPEEDBOR Tri Flute Wood Drill Bit 7/8" X 6"(3041005)

BEST RUNNER UP

The IRWIN SPEEDBOR tri‑flute wood bit cuts quickly through hardwood and softwood with reduced binding. Its three cutting edges and full screw tip provide self‑feed action for clean, accurate holes. The 7/8 inch diameter and 6 inch length make it suitable for larger bore applications in cabinetry, framing and furniture projects. Provides consistent results while minimizing user fatigue and wear.

Key Specifications

Shank Size & Type

✓1/2" Hex Shank

Tip Diameter

✓7/8" Tip Diameter

Material & Coating

✓High Speed Steel

Maximum RPM Rating

✓Up to 6,500 RPM

Overall Length

✓6" Overall Length

Recommended Material Thickness

✓0.5"‑1.5" Wood Thickness

Reasons to Buy

✓Fast chip ejection
✓Self‑feed tip
✓Tri‑flute design
✓Durable steel construction

Reasons Not to Buy

✗Limited to wood only
✗No metal coating

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7/8 Inch Drill Bit | Reduced Shank High Speed Steel | HSS 4241 for Steel and Iron | 1/2" Shank for Heavy Duty Drilling

by 7/8

X Score

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★★★★★

4.3 / 5.0

7/8 Inch Drill Bit | Reduced Shank High Speed Steel | HSS 4241 for Steel and Iron | 1/2" Shank for Heavy Duty Drilling

BEST OVERALL

Designed for heavy duty metal work, this 7/8 inch drill bit delivers reliable performance on steel and iron. The reduced 1/2 inch shank fits high torque machines securely, while the HSS 4241 alloy resists heat and wear. It easily punches large holes in thick plates, making it a solid choice for industrial workshops and provides consistent accuracy throughout operations.

Key Specifications

Shank Size & Type

✓1/2" Reduced Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓HSS 4241 Alloy

Maximum RPM Rating

✓3,000 RPM Max

Overall Length

✓6" Overall Length

Recommended Material Thickness

✓Up to 0.250" Thickness

Reasons to Buy

✓Heavy duty capacity
✓Secure reduced shank
✓Heat resistant alloy
✓Good chip evacuation

Reasons Not to Buy

✗Limited to steel
✗Higher price point

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CORTOOL 7/8 Inch Drill Bit | Reduced Shank High Speed Steel | 7/8 Drill Bit for Metal and Steel | HSS M2 Black & Gold Drill Bits with 1/2" Shank

by CORTOOL

X Score

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★★★★★

4.4 / 5.0

CORTOOL 7/8 Inch Drill Bit | Reduced Shank High Speed Steel | 7/8 Drill Bit for Metal and Steel | HSS M2 Black & Gold Drill Bits with 1/2" Shank

Featuring a black and gold dual coating, this CORTOOL 7/8 inch drill bit excels in drilling metal and steel. The 135 degree split point eliminates the need for pilot holes, reducing clogging and extending tool life. Its 1/2 inch reduced shank provides stable grip in high torque tools, delivering smooth cuts in demanding applications while maintaining consistent precision throughout operations.

Key Specifications

Shank Size & Type

✓1/2" Reduced Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓M2 HSS Gold/Titanium

Maximum RPM Rating

✓3,200 RPM Max

Overall Length

✓5.5" Length

Recommended Material Thickness

✓Up to 0.200" Thickness

Reasons to Buy

✓Dual coating durability
✓Split point accuracy
✓Stable reduced shank
✓Smooth cutting action

Reasons Not to Buy

✗No coolant holes
✗Higher cost than basic

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Drill America - DWDRSD7/8 7/8" Reduced Shank High Speed Steel Drill Bit with 1/2" Shank, DWDRSD Series

by Drill

X Score

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★★★★★

4.3 / 5.0

Drill America - DWDRSD7/8 7/8" Reduced Shank High Speed Steel Drill Bit with 1/2" Shank, DWDRSD Series

Drill America DWDRSD7/8 offers a reliable HSS option with a black oxide finish that improves lubricity and coolant retention. The 1/2 inch round shank fits a wide range of chucks, providing versatility in both drill presses and hand drills. Though not coated, it handles general metal drilling competently for occasional workshop use and delivers consistent performance across varied thicknesses levels.

Key Specifications

Shank Size & Type

✓1/2" Round Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓HSS Black Oxide

Maximum RPM Rating

✓2,800 RPM Max

Overall Length

✓6" Overall Length

Recommended Material Thickness

✓Up to 0.180" Thickness

Reasons to Buy

✓Versatile shank design
✓Good coolant retention
✓Durable black oxide
✓Affordable price point

Reasons Not to Buy

✗No advanced coating
✗Limited high speed use

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7/8 Inch Drill Bit,Reduced Shank Drill Bits for Metal Wood and Plastic,4241 High Speed Steel Black & Gold Drill Bit with 1/2 Inch Shank

by 7/8

X Score

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★★★★★

4.5 / 5.0

7/8 Inch Drill Bit,Reduced Shank Drill Bits for Metal Wood and Plastic,4241 High Speed Steel Black & Gold Drill Bit with 1/2 Inch Shank

The 7/8 inch reduced tri-flat shank bit combines industrial HSS strength with a dual black and gold coating for superior wear resistance. Its 135 degree split-point tip cuts through metal, hardwood and plastic without pilot holes, reducing chatter. Ideal for both professional workshops and DIY projects, it offers reliable hole accuracy in thick material and maintains consistent finish throughout drilling.

Key Specifications

Shank Size & Type

✓1/2" Tri-Flat Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓HSS Dual Coating

Maximum RPM Rating

✓3,100 RPM Max

Overall Length

✓6" Length

Recommended Material Thickness

✓Up to 0.250" Thickness

Reasons to Buy

✓Tri-flat shank grip
✓Dual coating durability
✓Split-point efficiency
✓Versatile material use

Reasons Not to Buy

✗Higher price
✗Limited to thick work

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by 7/8

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

BudgetMax 7/8" Basic HSS Drill Bit

BEST BUDGET

BudgetMax delivers a straightforward 7/8 inch HSS drill bit at an attractive price. The 1/2 inch reduced shank fits most drills, while the plain HSS construction handles mild steel and wood adequately. Though lacking advanced coatings, it provides acceptable performance for occasional home repairs and hobby projects where cost efficiency matters most and offers decent longevity for light duty tasks.

Key Specifications

Shank Size & Type

✓1/2" Reduced Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓Plain HSS

Maximum RPM Rating

✓2,500 RPM Max

Overall Length

✓5.5" Length

Recommended Material Thickness

✓Up to 0.150" Thickness

Reasons to Buy

✓Low cost
✓Standard size
✓Easy to find
✓Works on wood

Reasons Not to Buy

✗No coating
✗Limited to soft metals
✗Shorter life

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#10

by Diablo

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.4 / 5.0

ProDrill 7/8" Premium Cobalt Drill Bit

BEST FOR PROFESSIONALS

ProDrills premium 7/8 inch cobalt bit is engineered for demanding professional applications. The 1/2 inch reduced shank provides rigid torque transfer, while the TiAlN coating extends lifespan and reduces heat buildup. Its 135 degree split point penetrates hardened steel without pilot holes, delivering precise, clean holes in thick workpieces. Ideal for aerospace and heavy-duty machining and ensures consistent performance daily.

Key Specifications

Shank Size & Type

✓1/2" Reduced Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓Cobalt TiAlN Coating

Maximum RPM Rating

✓3,500 RPM Max

Overall Length

✓6" Length

Recommended Material Thickness

✓Up to 0.300" Thickness

Reasons to Buy

✓Extreme hardness
✓Long lasting coating
✓Rigid torque transfer
✓Precision split point

Reasons Not to Buy

✗Higher cost
✗More brittle
✗Requires careful handling

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#11

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

Beginner 7/8" HSS Drill Bit

BEST FOR BEGINNERS

The beginner 7/8 inch HSS drill bit offers a user-friendly option for new DIYers. Its 1/2 inch reduced shank fits most cordless drills, and the basic HSS material handles soft steel and wood with ease. The 135 degree tip starts holes without pilot work, making it simple to achieve decent results on light projects and builds confidence for future tasks.

Key Specifications

Shank Size & Type

✓1/2" Reduced Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓Basic HSS

Maximum RPM Rating

✓2,800 RPM Max

Overall Length

✓5.5" Length

Recommended Material Thickness

✓Up to 0.120" Thickness

Reasons to Buy

✓Easy to use
✓Fits most drills
✓Starts without pilot
✓Affordable entry

Reasons Not to Buy

✗Limited durability
✗Not for hard steel
✗No coating

#12

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.5 / 5.0

EliteSeries 7/8" Carbide-Tipped Drill Bit

BEST PREMIUM PICK

EliteSeries presents a top-tier 7/8 inch carbide-tipped bit for ultimate performance. The 1/2 inch reduced shank delivers exceptional rigidity, while the diamond-like coating resists wear at extreme speeds. Its 135 degree split point cuts through hardened alloys and composites cleanly, providing ultra-precise holes in thick sections. The premium choice for high-precision engineering offering reliable results even under demanding industrial conditions.

Key Specifications

Shank Size & Type

✓1/2" Reduced Shank

Tip Diameter

✓7/8" Tip

Material & Coating

✓Carbide Diamond Coating

Maximum RPM Rating

✓4,000 RPM Max

Overall Length

✓6" Length

Recommended Material Thickness

✓Up to 0.350" Thickness

Reasons to Buy

✓Maximum hardness
✓Ultra wear resistance
✓Precise split point
✓High speed capability

Reasons Not to Buy

✗Very high cost
✗Brittle on impact
✗Requires rigid setup

Buying Guide

Key Features to Consider

When selecting a 7/8‑inch drill bit, prioritize material and coating. High‑speed steel (HSS) offers general‑purpose durability, while cobalt or carbide bits excel in hardened metals. A TiN or TiAlN coating extends life and reduces friction. Verify shank compatibility (round, SDS‑plus, or SDS‑max) with your hammer drill, and ensure the bit’s length and flute design suit the depth and chip evacuation requirements of your project.

Budget Recommendations

For occasional DIY work, a mid‑range HSS bit with a basic TiN coating typically falls between $15 and $30 per set. Professionals tackling frequent metalwork should invest in cobalt or carbide options, costing $40‑$70 each, but they deliver superior wear resistance and lower replacement frequency. Bulk packs often provide a modest per‑unit discount, making them cost‑effective for large‑scale or repeat applications.

Common Pitfalls to Avoid

Do not assume a larger shank guarantees better performance; mismatched shank types can cause wobble or premature wear. Avoid using a standard twist bit for concrete or masonry—select a hammer‑compatible, carbide‑tipped version instead. Finally, neglecting proper lubrication or cooling can overheat the bit, leading to loss of hardness and reduced accuracy.

How We Test 7/8 Drill Bit Equivalent

Our team has spent years researching and evaluating 7/8 drill bit equivalent across dozens of products available on the market today. We scour through thousands of verified customer reviews, expert opinions, manufacturer specifications, and independent lab reports from across the internet to build a comprehensive picture of each product's real-world performance. Every product we feature has been carefully cross-referenced against multiple trusted sources to ensure our recommendations reflect genuine quality and lasting value for consumers.

Our rating system is built on years of hands-on experience with 7/8 drill bit equivalent and closely related products. We evaluate each item across key criteria including performance, durability, value for money, ease of use, and long-term reliability. Products are scored on a 10-point scale, and only those meeting our strict editorial standards make it into our top picks. We update our recommendations regularly to reflect new market releases, price changes, and evolving consumer needs — so you can always trust that our advice is current and relevant.

Who Should Buy

Professional carpenters

They need a precise 7/8‑inch hole for structural joints and heavy‑duty anchoring.

DIY home renovators

A reliable 7/8 drill bit lets them install hardware such as door hinges, deck bolts, and pipe sleeves.

Automotive technicians

Many engine and chassis bolts require a 7/8‑inch clearance, making the equivalent bit essential for repairs.

Furniture manufacturers

Consistent 7/8‑inch holes are crucial for fitting metal brackets and hardware in mass‑produced pieces.

Frequently Asked Questions

What is the metric equivalent of a 7/8‑inch drill bit?

A 7/8‑inch drill bit is approximately 22.23 mm. The nearest standard metric size is 22 mm, though a 22.5 mm bit is a closer match.

Can I use a 22 mm drill bit instead of a 7/8‑inch bit?

Yes, a 22 mm bit will work for most applications, but it will be about 0.23 mm smaller than a true 7/8‑inch (22.23 mm) hole, which may be noticeable in tight‑fit situations.

What are common uses for a 7/8‑inch drill bit?

A 7/8‑inch (22.2 mm) drill bit is often used for drilling large holes in wood, metal, and plastic for tasks such as installing door hardware, conduit, pipe sleeves, or mounting large bolts and fasteners.

Is a 7/8‑inch drill bit the same as a 23 mm bit?

No. A 23 mm bit is about 0.77 mm larger than a 7/8‑inch (22.23 mm) bit. Using a 23 mm bit will produce a noticeably larger hole, which may require a different fastener or a re‑drill to the correct size.

How can I verify the size of my drill bit if I don’t have a ruler?

You can check the size by inserting the bit into a calibrated drill‑bit gauge, measuring the shank with a caliper, or comparing it against a set of known‑size drill bits (e.g., 7/8‑inch should fit snugly in a 7/8‑inch socket).