Bosch CO21B 21-Piece Cobalt M42 Metal Drill Bit Set

Upgrade your toolbox with the Bosch CO21B Cobalt M42 Drill Bit Set. Engineered for professionals and DIYers tackling tough materials, these jobber-length bits are crafted with an upgraded M42 alloy containing 8% cobalt. This specialized composition provides 10 times the life of standard bits, making them a reliable choice for demanding projects. These bits are specifically designed to withstand high-heat applications and penetrate hard or abrasive metals. Whether you are working with stainless steel, cast iron, titanium, or aluminum, the surface-hardened tips ensure efficient penetration. The thick web-helix design adds stability during use, while the split point design on bits 1/8 inch and larger prevents walking and improves accuracy. For added security and performance, bits 3/16 inch and larger feature a three-flat shank to provide a better grip in your drill. All 21 pieces come organized in a durable plastic case, making it easy to transport and store your professional-grade bits for your next metalworking task.