Cobalt Drill Bit Set 100-Piece M35 HSS Jobber Length - Durable Metal

In this review of the Cobalt Drill Bit Set the bottom line is clear: this 100-piece M35 kit is aimed at DIYers and trade users who need a wide range of sizes for drilling metals and common workshop materials. The biggest reason to buy is the variety and hardness of the M35 cobalt bits, which make it possible to tackle stainless steel, cast iron and other tough materials without constantly swapping specialty bits. Our review found the set best suited to general metalworking and mixed-project use rather than heavy industrial production.

Key Features

• Comprehensive size range: The 100 pieces include multiple small sizes and larger sizes from 3/64' to 3/8' so users rarely need to buy an extra bit for common drilling tasks.
• M35 cobalt construction: The M35 material keeps cutting edges harder and more heat-resistant than plain HSS, helping when drilling stainless steel and hardened parts.
• 135 degree point tip: The split 135 degree point helps with fast chip removal and self-centering to reduce walk-off when starting holes in metal.
• Jobber length design: The standard jobber length balances rigidity and reach for general drill press and handheld drill work without excessive wobble.
• Indexed storage case: The included case has size indexing that keeps bits organized and protected, making it straightforward to find the size you need on the job.

Who It's For

The set is ideal for hobbyists, home workshop owners and trade professionals who need a broad selection of sizes to work on stainless steel, cast iron, aluminum, copper, wood and plastics. It is particularly useful when projects require multiple small to medium hole sizes and you value an indexed case for quick access.

This kit is less suited to high-volume industrial shops where extreme durability and constant reprovisioning are required; some buyers report bits can dull or break under heavy continuous use, so production environments should consider industrial-grade single-size assortments or frequent replacement plans.

Pros & Cons

Pros

• Wide selection of sizes covers most workshop needs without additional purchases.
• M35 cobalt composition provides improved heat resistance and cutting on hard metals.
• 135 degree tip and twist design promote self-centering and quicker chip clearance.
• Organized index case makes storage and size selection fast and tidy.

Cons

• Some users report limited durability under heavy or repeated production use, with occasional dulling or breakage.

Specifications

Brand	MACXCOIP
Material	M35 cobalt high speed steel
Piece count	100 pieces (sizes 3/64' to 3/8')
Point angle	135 degree tip
Length	Jobber length
Storage	Indexed storage case

Our Verdict

The Cobalt Drill Bit Set is a strong value for anyone needing a broad assortment of durable bits for metal and general-purpose drilling. It delivers useful M35 hardness, helpful tip geometry and a tidy indexed case, making it a great choice for home shops and light professional use; heavy industrial users should factor in possible faster wear under continuous high-stress use.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes. The M35 cobalt composition and 135 degree tip make them appropriate for stainless steel and other hardened metals.

Does the set include both small and large sizes?
Yes. The 100-piece kit covers sizes from 3/64' through 3/8' with multiple counts of common small sizes.

Will these work in a handheld drill?
Yes. The jobber length and standard shank sizes work in most handheld drills and drill presses for routine tasks.