JEFE HEX 29 PC M35 Cobalt Drill Bit Set - Durable Metal Bits

In this review of the JEFE HEX 29 PCS M35 Cobalt Drill Bit Set the bottom line is simple: this kit is aimed at homeowners, fabricators and mechanics who need a durable, heat resistant set for drilling metals. The reviewer found the set stands out for its cobalt alloy construction and practical case, which together make it useful for repeated work on stainless steel, mild steel and other hard alloys. For anyone who drills metal frequently and wants bits that resist heat and wear, this set is a compelling value.

Key Features

• 5% cobalt HSS: Provides higher heat resistance and extended tool life compared to standard high speed steel bits, so bits last longer under heavy use.
• Gold oxide finish: Acts as a lubricant and wear barrier, helping bits cut cleaner and resist surface abrasion during drilling.
• 135 degree split point: Self-centering tip reduces walking and often removes the need for a pilot hole when starting holes in metal.
• Three-flat and reduced shanks: Three-flat shanks on smaller sizes reduce spinning in the chuck and larger bits use a 3/8 in reduced shank for broad drill compatibility.
• Full size range: The 29-piece assortment covers 1/16 in through 1/2 in in 1/64 in increments, so you can match exact hole sizes without guesswork.
• Portable round case: Ergonomic, clip-ready case keeps bits organized and attaches to a tool belt for immediate access on the job.

Who It's For

This set is best suited to DIYers, metalworkers and tradespeople who regularly drill stainless steel, cast iron, titanium alloys, high temperature alloys and other hard materials. The M35 cobalt blend and split point tip make it a practical choice for workshop and maintenance tasks where heat buildup and tool life matter.

Those who only need bits for occasional wood or soft plastic work, or who require specialty coated carbide bits for industrial production drilling, may prefer a different, more specialized kit. Also, users who need metric sizes will need to look elsewhere since this set is imperial only.

Pros & Cons

Pros

• High durability from 5% cobalt composition results in longer life when drilling hard metals.
• Gold oxide finish improves wear resistance and helps bits cut smoother.
• Comprehensive size selection reduces the need to buy individual bits for common hole sizes.
• Convenient round carrying case with clip keeps bits organized and portable.

Cons

• Imperial-only sizes mean users who need metric measurements must purchase additional sets.
• Not a coated carbide option, so extreme production environments may favor different materials.

Specifications

Our Verdict

The JEFE HEX 29 PCS M35 Cobalt Drill Bit Set is a solid, cost-effective choice for anyone who drills metal regularly and wants bits that resist heat and last. With a full imperial size spread, a helpful carrying case and practical features like the split point and three-flat shanks, it offers real value for hobbyists and pros alike, though metric users or those needing carbide should consider alternatives.

Frequently Asked Questions

Are these bits good for stainless steel?
Yes, the M35 cobalt composition and 135 degree split point make them suitable for drilling stainless steel and other hard alloys.

Will the bits fit standard drills?
Yes, smaller bits have three-flat shanks to reduce slipping and larger bits use a 3/8 in reduced shank compatible with most drill chucks and chucks with an adapter.

Does the set include every fraction between sizes?
The set covers sizes from 1/16 in to 1/2 in in 1/64 in increments, providing a continuous range of imperial sizes.