Triumph Twist Drill 1/16 in.-1/2 in. Black/Bronze Oxide High Speed Steel Jobber Length Twist Drill Bit Set with Metal Index (15-Piece)
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Drills finished with black and bronze oxide can be used in cast iron, steel (low/medium carbon, high alloy, stainless) and tough/medium/high-tensile strength alloys. Split points extend the drills life and are good for drilling on curved surfaces. They require less effort and are best suited in alloy steels.


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