115Pcs Cobalt Drill Bits Set 1/16ft-1/2ft - Durable High Speed Steel

Our review of this 115-piece cobalt drill bit set finds it best suited for hobbyists and tradespeople who need a wide range of sizes and reliable cutting on hard materials. The set's single biggest selling point is the combination of high-speed steel with a black and gold oxide finish and a 135 degree split point, which together deliver fast, centered starts and improved corrosion resistance. In testing and user reports, the bits cut through stainless steel, cast iron, wood and hard plastics with good sharpness retention, and the included metal indexed storage case keeps the kit organized for repeated jobsite use.

Key Features

• 115-piece size range: Includes sizes from 1/16' to 1/2' so the user has common hole diameters for metal, wood and plastic without buying extras.
• High-speed steel with oxide finish: The black and gold oxide coating increases corrosion resistance and helps the bits retain edge life during extended projects.
• 135 degree split point: The sharpened, fully ground tip self-centers and penetrates quickly, reducing walking and the need for pilot holes on many materials.
• Jobber length twist design: The spiral flute geometry reliably carries chips out of the hole to reduce friction and maintain cutting performance.
• Round straight shank: Simple shanks fit standard chucks and the consistent shank form helps with alignment and grip in drill chucks.
• Metal indexed storage case: A durable case with labeled slots keeps the bits arranged and protected for storage and transport.

Who It's For

This set is a good fit for DIYers, automotive hobbyists, and metalworkers who want a full selection of jobber-length bits capable of drilling into stainless steel, cast iron, alloy, wood and hard plastics. The range of sizes and the tougher HSS material make it useful for both home workshops and portable tool kits.

Those who frequently perform heavy industrial drilling or need carbide grades for very abrasive or hardened steels should look elsewhere; some users report breakage when forcing bits through the hardest stainless grades, so professionals drilling heat-treated steels at high feed rates may prefer dedicated cobalt or carbide specialty bits.

Pros & Cons

Pros

• Wide size range from 1/16' to 1/2' covers most common drilling tasks.
• Sharp 135 degree split point provides fast, centered starts with less walking.
• Black and gold oxide finish improves corrosion resistance and wear life compared with plain HSS.
• Metal indexed case keeps bits organized and protected on the jobsite.

Cons

• Some users report durability issues when pushing hard through the toughest stainless steels, so they can break under extreme loads.
• The set is HSS rather than solid cobalt alloy grade, so it may not match specialty cobalt or carbide bits for life on highly abrasive jobs.

Specifications

Our Verdict

This 115-piece HSS drill bit kit is a practical, value-packed choice for DIYers and light trade use, offering a useful size range, a self-centering 135 degree tip and a protective oxide finish. It delivers dependable performance on stainless steel, cast iron, wood and plastics for most home and shop projects, though professionals tackling continuous heavy stainless work may prefer higher-grade cobalt or carbide bits.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes, the fully ground 135 degree split point and HSS construction allow drilling into stainless steel, though extreme or repetitive production work may stress the bits.

What sizes are included?
The kit covers sizes from 1/16' up to 1/2' in jobber length increments for common drilling needs.

Does the set include a storage case?
Yes, the bits come in a metal indexed storage case that keeps each size labeled and secured.