Cobalt Drill Bit Set 21pcs 1/16in-3/8in - Durable HSS Jobber Bits

In this review the 21Pcs Cobalt Drill Bit Set stands out as a practical all-rounder for hobbyists and tradespeople who need a compact, indexed kit of strong, sharp bits. The single biggest reason to buy is the M35 cobalt construction combined with a 135 degree split point that lets these bits start cleanly and cut through stainless steel, cast iron and other tough materials without much walking. The included metal storage box with a size index keeps the 21 bits organized and portable for a busy workshop or a jobsite.

Key Features

• M35 cobalt HSS: The cobalt coating and high speed steel core improve heat resistance and edge retention when drilling hard metals.
• 135 split point tip: Self-centering design reduces bit walk and gives faster, more accurate starts in metal and wood.
• Twist jobber length: The standard jobber length provides reach for general purpose drilling while maintaining rigidity to minimize wobble.
• Wide size range: The set covers common and less common sizes from 1/16in up to 3/8in so you have the right bit for many metalworking and woodworking tasks.
• Metal indexed box: A sturdy metal storage case with size markings keeps bits organized, easy to find, and protected in transit.
• Polished flutes: Smooth flutes help chip removal and reduce heat buildup for cleaner holes and longer bit life.

Who It's For

The set is best for mechanics, metal fabricators, machinists and dedicated DIYers who regularly drill stainless steel, hardened bolts, cast iron or other tough materials and want a compact, organized selection of strong bits. The M35 cobalt construction and split point make it well suited for jobs that require reliable starts and frequent metal drilling.

Those who primarily need metric sizes, very large diameters beyond 3/8in, or occasional light woodworking only may prefer a different set tailored to those needs. Also, users expecting extreme long-term durability for the smallest bits should note mixed reports about longevity on the smallest sizes under abusive use.

Pros & Cons

Pros

• Durable M35 cobalt HSS construction that cuts through stainless and hardened metals effectively.
• 135 split point provides fast, accurate starts and reduces walking on difficult surfaces.
• Comprehensive 21-piece range with several duplicate small sizes and a metal indexed storage box for easy organization.
• Polished, hardened tips stay sharp initially and feel precise in use.

Cons

• Some customers report mixed durability on the smallest diameter bits when used on extreme hard materials.
• Limited to fractional inch sizes and tops out at 3/8in, so it may not cover every workshop need.

Specifications

Brand	YOHANSEN
Material	M35 cobalt high speed steel
Tip angle	135 degree split point
Bit range	1/16in to 3/8in (21 pieces)
Lengths	Twist jobber length
Storage	Metal indexed storage box

Our Verdict

The 21-piece M35 cobalt drill bit set is a smart, value-oriented pick for anyone who drills metal regularly and wants a portable, organized kit. The split point and HSS cobalt make it effective on stainless and cast iron, and the metal case keeps the collection tidy. For general workshop use and metalworking tasks up to 3/8in these bits offer strong performance and good value.

Frequently Asked Questions

Can these drill bits cut stainless steel?
Yes. The M35 cobalt HSS and 135 degree split point are designed to handle stainless steel and other hard metals.

Are the sizes clearly marked?
The metal storage box includes a size index so individual bits are easy to identify and return to their slot.

What is the largest size in the set?
The set ranges up to 3/8in, covering a common range for general metal and wood drilling.