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ANSI Black Oxide Jobber Drill Bit 135 Split Point Twist Drill Straight Shank Black Oxide: A black finish is achieved by steam tempering - a thermal process which imparts a non-metallic surface to the tool. Thi...
ANSI Black Oxide Jobber Drill Bit 135 Split Point Twist Drill Straight Shank Black Oxide: A black finish is achieved by steam tempering - a thermal process which imparts a non-metallic surface to the tool. Thi...