Bosch CO21B 21PC Cobalt M42 Drill Bit Set (21-Pack)

The 21 pc. Cobalt M42 Drill Bit Set from Bosch is expertly crafted for demanding drilling tasks across various materials, including stainless steel, cast iron, and aluminum. Each bit in this collection features a surface-hardened tip designed to penetrate tough, abrasive surfaces while ensuring greater durability thanks to the enhanced M42 alloy, which includes 8% cobalt. This special construction provides an impressive ten times the longevity compared to standard bits, making it an essential addition for professionals and DIY enthusiasts alike.