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What are Drill Bits Made From & How Are They Made?

BOSCH Cobalt M42 metal drill bits are engineered with upgraded M42 alloy, containing 8% cobalt. These hard-core Cobalt bits deliver 10x life vs.

BOSCH CO2147B 1-Piece 5/16 In. x 4-1/2 In. Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron