Bosch CO21B

Cobalt M42 drill bit – provides upgraded M42 Cobalt jobber-length bits designed for durability, high heat resistance and Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum Enhanced M42 alloy material – contains 8% Cobalt alloy that delivers 10x life vs. Standard bits High-heat resistant bits – withstand high... more-temperature applications for extended periods of time Thick web-helix design – provides additional stability in tough applications.Case Type:Plastic Surface-hardened tip – penetrates tough abrasive materials Split points on bits 1/8 In. and larger – allow for easy starts with no skating, eliminating the need for a center punch Three-flat shank on bits 3/16 In. and larger – deliver better bit grip