29Pcs Cobalt Drill Bit Set 135 Tip - Durable Black & Gold Jobber Bits

In this review of the 29Pcs Cobalt Drill Bit Set the bottom line is simple: this set is aimed at professionals and serious DIYers who need a wide range of sizes and reliable performance when drilling metal, wood, and plastic. The reviewer found the collection of sizes and the 135 degree split point to be the single biggest reason to buy, since those features make it easy to start holes cleanly and tackle hardened materials with less walking. The indexed metal case also makes it convenient to carry and keep bits organized on the job.

Key Features

• Comprehensive size range: The 29 sizes from 1/16 in to 1/2 in cover unusual fractions and standard jobber lengths so you rarely need a second set.
• 135 degree split point: The split point design prevents walking and provides accurate starts for faster, straighter penetration with less pressure.
• High speed steel construction: Cobalt alloy HSS offers strength for drilling through stainless steel, cast iron, and other tough metals without dulling immediately.
• Black and gold oxide finish: The coating improves corrosion and wear resistance, helping bits last longer in humid or workshop environments.
• Twist drill geometry: The twist flutes clear chips efficiently to reduce heat buildup and keep holes cleaner across steel, wood, and plastic.
• Indexed metal storage case: A durable, labeled case keeps bits organized and easy to transport between job sites.

Who It's For

This set is best for tradespeople, machinists, and serious DIYers who frequently drill a variety of materials and need access to many fractional sizes in one kit. The inclusion of hardier HSS cobalt and a 135 split point makes it suitable for industrial metalwork as well as workshop projects.

Those who drill only occasional soft-material holes or who prefer carbide or coated specialty bits for extremely abrasive materials might look elsewhere; similarly, if absolute top-tier longevity on the smallest bits is critical, some users reported mixed durability for the finest sizes and may prefer individually hardened specialty bits.

Pros & Cons

Pros

• Wide size selection covers common and uncommon fractional sizes needed for repairs and fabrication.
• Split point and straight shank give accurate starts and reduce walking for cleaner holes.
• Black and gold oxide finish improves corrosion resistance and wear life in typical shop use.

Cons

• Some users report mixed durability for the smallest diameter bits under heavy use, so they can wear faster than larger sizes.
• Not a specialized coating like TiN or carbide tips, so extreme high-volume production drilling may show faster wear.

Specifications

Brand	YOHANSEN
Piece count	29 pcs (1/16 in to 1/2 in)
Material	High speed steel with cobalt alloy
Tip angle	135 degree split point
Finish	Black and gold oxide coating
Shank type	Round straight shank
Storage	Durable indexed metal case

Our Verdict

The YOHANSEN 29Pcs Cobalt set is a practical, value-oriented kit for professionals and hobbyists who need many fractional sizes and reliable starts in metal, wood, and plastic. Its HSS cobalt construction, 135 split point, and indexed case make it a good all-around jobber set; users who demand extreme longevity on the tiniest bits should be aware of mixed reports but most will find this set excellent value for everyday shop and jobsite tasks.

Frequently Asked Questions

Can these bits drill stainless steel?
Yes, the high speed steel with cobalt alloy and the 135 degree split point are designed to handle stainless steel and other hardened metals.

Are the sizes clearly marked in the case?
Yes, the kit includes an indexed storage case that organizes and labels each size for easy selection and transport.

Will the bits work in a cordless drill?
Yes, the round straight shanks fit standard chucks on cordless and corded drills for general metal, wood, and plastic work.