Cobalt Drill Bit Set 234Pcs M35 HSS Jobber Length - Durable Metal

In this review of the Cobalt Drill Bit Set the bottom line is clear: this 234 piece M35 kit is aimed at hobbyists, metalworkers and tradespeople who need a broad range of sizes and tougher bits for stainless and cast iron. The biggest reason to buy is the sheer variety and the use of M35 cobalt HSS in a jobber length format, which gives better heat resistance and edge life when drilling hardened metals and a wide range of other materials.

Key Features

• 234 Size Range: The set includes 234 drill bits from 3/64' to 1/2' so users rarely need to stop mid-job to shop for a size not covered by the kit.
• M35 Cobalt Alloy: Bits are made from M35 cobalt high speed steel for improved hardness and heat resistance when cutting stainless steel and cast iron.
• 135 Degree Point: A 135 degree point and twist design provides faster cutting and self centering to reduce bit walk and help start holes accurately.
• HSS Jobber Length: Jobber length bits balance reach and rigidity, making them versatile for both hand drills and drill press use without excessive wobble.
• Indexed Storage Case: Indexed holders and a sturdy case keep sizes organized and make it simple to find and return bits during projects.

Who It's For

The kit is best for home mechanics, fabricators, general contractors and serious DIYers who tackle a mix of metals and softer materials and want a comprehensive set of sizes on hand. The M35 cobalt composition makes it suited to drilling stainless steel, iron castings, copper, aluminum as well as wood and plastics where heat and wear resistance matter.

Those who primarily drill a single material or who need industrial carbide performance for large production runs should consider purpose-made bits for that specific job, as this set is optimized for versatility rather than replacing specialized carbide tooling.

Pros & Cons

Pros

• Extensive size selection covers frequent and uncommon sizes for flexibility on-site.
• M35 cobalt construction improves cutting life and performance on hardened metals.
• 135 degree tip and twist geometry aid in accurate starts and fast chip evacuation.
• Compact index case keeps bits organized and portable between jobs.

Cons

• Some users report mixed results on durability versus expectations when used heavily on the hardest steels.
• Higher wear when used without correct speeds, feeds and lubrication on very hard alloys.

Specifications

Our Verdict

The Cobalt Drill Bit Set delivers strong value for anyone who needs a ready supply of sizes and better heat resistance than standard HSS. It is a practical, versatile kit for metalworking and general shop use, offering organized storage and M35 durability that make it a sensible purchase for serious DIYers and tradespeople seeking a long, useful tool life.

Frequently Asked Questions

Can these bits cut stainless steel?
Yes, the M35 cobalt alloy and 135 degree tip are intended to perform well on stainless steel when used with proper speed and lubrication.

Will the bits fit a hand drill?
Yes, the jobber length bits and common shank sizes are suitable for hand drills and drill presses.

How is the set organized?
The set ships in an indexed storage case with labeled holders for quick size selection and neat storage.