Cobalt Bit 5/16″

Bosch CO2147, 5/16 Inch Cobalt Drill Bit.
Designed for durability, high heat resistance. Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum. Enhanced M42 alloy material contains 8 percent Cobalt alloy that delivers 10x life vs. Standard bits. High-heat resistant bits withstand high-temperature applications for extended periods of time. Thick web-helix design provides additional stability in tough applications. Surface-hardened tip penetrates tough abrasive materials.