5% Cobalt Drill Bit Set (1/16-3/8 in, 21PCS) - Heavy Duty Jobber

In this review of the 5% Cobalt Drill Bit Set, the bottom line is clear: this kit is for users who need durable, highperformance bits for hard metals and stainless steel. The reviewer found the set especially useful for heavy duty workshop work where longevity and cutting speed matter most. Built from 5% true cobalt and finished as fully ground bits, the set promises longer life and faster drilling compared with standard HSS bits, making it a sensible choice for professionals and serious DIYers who regularly drill steel, cast iron, or hardened materials.

Key Features

• 5% cobalt construction: Provides increased heat and wear resistance so bits last longer when drilling stainless steel and other hard metals.
• 68 HRC hardness: The high hardness improves edge retention so the cutting point stays sharp through many holes.
• Split point design: Reduces walking and improves precision when starting holes in metal or hard wood.
• 21 piece jobber lengths: A 1/64 in increment set from 1/16 to 3/8 in covers common sizes for bolts, studs and general metalwork.
• Sturdy metal case: Q235 cold rolled steel case keeps bits organized and opens and closes smoothly for easy access on the job.

Who It's For

The set is aimed at metalworkers, mechanics and fabricators who need reliable bits for stainless steel, cold rolled steel, cast iron and other hard metals, as well as occasional work in hardwoods and plastics. Users who value reduced downtime and fewer bit changes will appreciate the longer life and higher drill speed this cobalt construction can deliver.

Casual hobbyists who rarely drill metal or who only need a handful of sizes might find the kit overbuilt and could choose a simpler, lower cost HSS set instead. Also, if extreme flexibility for masonry or ceramic tile drilling is required, this kit is not intended for those materials.

Pros & Cons

Pros

• High quality cobalt steel delivers improved durability and thermal resistance for metal drilling.
• Split point geometry gives better centering and faster starts without pilot holes.
• Comprehensive 21 piece range in 1/64 in increments covers most workshop needs.
• Durable Q235 steel case protects the set and keeps sizes organized.

Cons

• Higher initial cost compared with standard HSS sets, though cost per hole is lower over time.
• Some users report mixed durability results under extreme misuse, so proper speeds and lubrication are still required.

Specifications

Material	5% true cobalt HSS
Hardness	68 HRC
Piece count	21 pieces (jobber length)
Size range	1/16 in to 3/8 in in 1/64 in increments
Point type	Split point design
Case	Q235 cold rolled steel metal case

Our Verdict

The 5% Cobalt Drill Bit Set is a practical investment for professionals and serious DIY users who drill stainless steel, hard metals and cast iron regularly; its cobalt alloy and split point design deliver faster drilling and longer life, making the higher upfront cost worthwhile because it reduces tool changes and lowers cost per hole.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes, the 5% cobalt construction and split point design make them suitable for stainless steel and other hard metals when used at appropriate speeds with cooling.

What sizes are included?
The set includes 21 jobber length bits from 1/16 in to 3/8 in in 1/64 in increments.

Does the kit come with a protective case?
Yes, the bits are stored in a durable Q235 cold rolled steel metal case that opens and closes smoothly.