Compatible Models

The Bosch CO4138 12 pc. 11/64 In. x 3-1/4 In. Cobalt Drill Bit is the correct replacement for the following model numbers.

Description

Bosch cobalt drill bits are specially designed for drilling in hard steel. Thick web helix delivers fast material removal combined with increased durability for maximum efficiency and performance. Each bit is manufactured to exacting specifications and features a split point that starts on contact with no walking or skating, eliminating the need for a center punch.

Benefits
Withstands high-temperature applications for extended periods of time (up to 1,100°F)
Available in jobber length, full shank
Rigid, thick web design adds stability to bit in tough applications
Best used for drilling into light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, stainless steel and titanium
Surface hardened to penetrate tough abrasive materials

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