Cobalt Drill Bit Set 29 PCS M35 High Speed Steel - Durable Cuts

In this review of the Cobalt Drill Bit Set 29 PCS the bottom line is simple: this kit is aimed at DIYers and tradespeople who often drill hardened metals and need a wider range of fractional sizes in jobber length. The single biggest reason to buy is the use of M35 high speed steel with 5% cobalt, which provides noticeably better wear resistance and heat tolerance than ordinary bits when cutting stainless steel, cast iron or other tough alloys. The set's 1/16' to 1/2' range in 1/64' increments also makes it convenient for projects that need precise fractional sizes.

Key Features

• M35 high speed steel: offers extended tool life and better heat resistance compared with standard HSS when drilling hardened metals.
• 135 split point: self-centering geometry reduces walking so holes start cleaner and drilling is faster for accurate work.
• Fully ground twist design: clears chips more efficiently and reduces friction and heat for cooler performance on long runs.
• Comprehensive size range: 29 jobber length bits from 1/16' to 1/2' by 1/64' increments provide fine fractional sizing without buying extras.
• Round straight shank: fits most drill chucks securely and is suitable for handheld drills and drill presses used in metal and wood tasks.

Who It's For

This kit is best for metalworkers, fabricators, mechanics and serious hobbyists who frequently drill high tensile or hardened materials such as stainless steel, cast iron, titanium alloys and hard plastics. The M35 cobalt composition is particularly suited to jobs where bit wear and heat buildup are problems.

Less experienced users who only drill soft woods or occasional household tasks may prefer a smaller, cheaper HSS set; likewise, anyone who needs metric sizes or longer, specialty lengths should look elsewhere since this is a jobber length fractional set focused on common imperial sizes.

Pros & Cons

Pros

• Durable M35 cobalt steel provides improved life and heat resistance compared to ordinary bits.
• Split point geometry helps start holes without walking for more precise results.
• Wide selection of 29 fractional sizes covers many workshop needs without extra purchases.

Cons

• Some users report mixed longevity; a few bits may dull or break sooner under extreme duty, so performance can vary with use conditions.

Specifications

Brand	HIDOTOL
Material	M35 High Speed Steel (5% cobalt)
Point Geometry	135 degree split point
Shank Type	Round straight shank
Sizes Included	29 pcs, 1/16' to 1/2' by 1/64' increments
Length	Jobber length
Case	Indexed round case

Our Verdict

The Cobalt Drill Bit Set 29 PCS is a practical, good-value choice for users who work with hardened metals and need precise fractional sizes. Its M35 cobalt composition and split point design deliver real advantages in heat resistance and hole-starting accuracy, making the set worth choosing for metalworking and demanding shop tasks; casual users who rarely drill metal may prefer a simpler set.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes. The M35 cobalt composition and split point make them appropriate for stainless steel and other hard alloys.

Do the bits come in a case?
Yes. The set includes an indexed round case for organized storage and easy size selection.

Will these work in a handheld drill?
Yes. The round straight shank fits most chucks and is fine for handheld drills and drill presses with proper feed and speed.