Drill America 25pc Metric Cobalt Drill Bit Set - Heavy Duty Precision

In this review the Drill America 25-piece metric cobalt drill bit set is evaluated for professionals and serious hobbyists who need reliable bits for hard metals. The bottom line: this set is best for users who frequently drill stainless steel, titanium or other high-tensile alloys and want higher heat resistance and longer cutting life than standard HSS bits. The standout reason to buy is the M35 cobalt construction, which permits faster cutting and better red hardness under heat, delivering dependable performance on challenging materials.

Key Features

• M35 cobalt construction: Provides superior heat resistance and red hardness so bits can run at higher speeds and retain edge life when cutting tough alloys.
• 135 degree split point: Self-centering tips reduce walking and make starts more accurate on metal and thin materials.
• Metric size range: The 25-piece set covers 1mm to 13mm in 0.5mm increments, offering fine size selection for precision work.
• Heavy duty standard: Manufactured to Aerospace Standard 907 for consistent manufacturing quality appropriate for industrial and contractor use.
• Durable round case: The plastic round storage holder is rust-resistant, water-proof and shatter-proof for secure transport and long-term storage.
• Versatile use: Designed for stainless steel, Inconel, titanium and also performs well on wood and plastic when precision is required.

Who It's For

The set is aimed at metalworkers, fabricators, mechanics and serious DIYers who need a compact assortment of high-performance metric bits for drilling hard, high-tensile materials. Those working with stainless steel, heat-treated alloys, or aerospace-grade metals will appreciate the heat resistance and durability of the cobalt bits.

People who only do occasional light drilling in soft materials and want a low-cost, general-purpose set should look elsewhere, as cobalt jobber bits are optimized for longevity and cutting performance rather than lowest initial cost. Also, users who need fractional inch sizes instead of metric may need a different kit.

Pros & Cons

Pros

• Excellent heat resistance and speed capability due to M35 5% cobalt, reducing wear under heavy use.
• 135 degree split points provide accurate, self-centering starts and reduced walking on metal surfaces.
• Comprehensive metric coverage from 1mm to 13mm in 0.5mm steps gives fine control over hole sizes.
• Sturdy, water-proof round case keeps bits organized and protected for jobsite transport.

Cons

• Durability reports are mixed for a few users on larger sizes, so extreme lateral forces or misuse can still break bits.
• Metric-only sizing may not suit users who prefer fractional inch measurements.

Specifications

Brand	Drill America
Series / Model	DWDCO Series ZMD/A4025-CO-PC
Material	M35 cobalt (5% cobalt)
Tip geometry	135 degree split point
Set contents	25 pieces, metric sizes 1mm to 13mm by 0.5mm
Case	Round plastic storage holder, rust-resistant and water-proof
Manufacturing standard	National Aerospace Standard 907

Our Verdict

The Drill America 25-piece metric cobalt set is a strong choice for professionals and serious hobbyists who need a dependable, heat-resistant set for hard metals. With M35 cobalt, split-point tips and a compact protective case, it delivers good long-term value for metalworking applications, provided users respect proper feed and speed to avoid breaking larger bits under side load.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes, the M35 cobalt composition and 135 degree split point make them well suited for stainless steel and other high-tensile materials.

What sizes are included in the set?
The set includes 25 metric sizes from 1mm up to 13mm in 0.5mm increments.

Is the case durable for jobsite use?
The round plastic case is rust-resistant, water-proof and shatter-proof, designed to protect bits during transport and storage.