IRWIN Cobalt Drill Bit Set, 25 Pieces, from 1.0 to 13.0 mm in 0.5 mm increments.

The IRWIN cobalt drill bit set (reference 559380) offers 25 precision-ground bits ranging from 1.0 mm to 13.0 mm in 0.5 mm steps. Manufactured from M35 high-speed steel with 5% cobalt content, these bits provide excellent heat resistance and hardness, making them suitable for drilling in tough materials such as stainless steel, cast iron, and hardened alloys.

Each bit features a 135° split point design that ensures self-centering and reduces bit walking, allowing for accurate hole placement without the need for a center punch. The set comes organized in a robust metal storage case, keeping bits secure and easily accessible. Ideal for professional tradespeople and serious DIYers requiring reliable performance in demanding applications.