Crosstar M35 Cobalt Drill Bit Set 21pc - Heavy-Duty Metal Drills

In this review of the Crosstar M35 Cobalt Drill Bit Set the bottom line is simple: this kit is for professionals and serious hobbyists who need reliable bits that cut hardened metal without frequent replacement. The reviewer found the biggest reason to buy is the combination of premium M35 cobalt construction and TiAlN coating, which together deliver heat resistance and wear life suited to automotive, HVAC, and metal fabrication tasks. For anyone drilling stainless steel, cast iron, or other tough alloys, this set is a practical step up from standard HSS kits.

Key Features

• M35 cobalt alloy: The 5% higher cobalt content versus typical M2 offers superior hardness and edge retention for drilling hardened metals to HRC 50+.
• TiAlN coating: Titanium aluminum nitride resists heat to about 1,100F and reduces friction, extending bit life compared with standard titanium coatings.
• Precision pilot point tip: The self-centering bullet point prevents walking on curved or smooth surfaces and helps achieve fine drilling accuracy.
• 21-piece range: The kit includes the most-used sizes from 1/16in to 1/2in with duplicates for high-demand sizes, reducing downtime from broken or worn bits.
• Spiral flute zero-tear design: Fast chip evacuation reduces clogging and helps maintain cutting temperature and finish when working dense metals.
• Durable storage case: The shockproof case with laser-etched labels keeps bits organized and protected in a busy workshop.

Who It's For

The Crosstar set is aimed at mechanics, metal fabricators, HVAC technicians, and any DIYer who regularly drills stainless steel, hardened steels, or cast iron and wants a single kit to handle most common sizes. Its toughness and heat-resistant coating make it suitable for high-heat, repetitive work where longevity matters.

This kit is less appropriate for occasional wood or masonry work where carbide or brad-point bits are better choices, and casual users on a strict budget might prefer a basic HSS set if they do not need cobalt or TiAlN benefits.

Pros & Cons

Pros

• Exceptional hardness and wear resistance from M35 cobalt for demanding metal work.
• TiAlN coating that reduces friction and extends life under high-heat conditions.
• Self-centering pilot point improves accuracy and prevents walking on starts.
• Organized 21-piece kit with duplicates and a sturdy case for workshop efficiency.

Cons

• Higher upfront cost than basic HSS sets, which may be unnecessary for very occasional users.
• Not optimized for wood or masonry applications where other bit types perform better.

Specifications

Brand	Crosstar
Material	M35 cobalt steel (TiAlN coated)
Sizes included	21 pieces, 1/16in to 1/2in with duplicates
Tip type	Precision pilot point, 135 split point
Coating	Titanium aluminum nitride (TiAlN)
Applications	Hardened steel, stainless steel, cast iron, general metalworking
Storage	Shockproof case with laser-etched size labels

Our Verdict

The Crosstar M35 Cobalt Drill Bit Set is a solid investment for professionals and serious DIYers who need durable, heat-resistant bits for metalwork. Its M35 alloy and TiAlN coating deliver longer life and consistent performance, and the organized 21-piece kit offers practical value for shop use. Choose this set if you regularly drill hardened metals and value reliability over the lowest possible purchase price.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes, the M35 cobalt composition and TiAlN coating are specifically designed to cut stainless steel and other hardened metals.

Do the bits come with a case?
Yes, the set ships in a shockproof case with laser-etched size labels for easy organization.

Will these bits work for wood?
They will cut wood, but they are optimized for metal; brad-point or wood-specific bits give cleaner results for woodworking.