Bosch CO2139B 3/16″ Cobalt M42 Drill Bit Card

Crafted by Bosch, this 3/16-inch by 3-1/2-inch cobalt M42 drill bit is engineered for superior performance and durability in tough applications. Its innovative M42 cobalt alloy composition, featuring 8% cobalt, ensures an extended lifespan—up to ten times that of standard bits—while also providing exceptional resistance to heat and wear. The surface-hardened tip penetrates even the most abrasive materials with ease, making it suitable for drilling through stainless steel, cast iron, titanium, and aluminum.