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21 Piece set.Manufactured from M42 HSS containing 8% cobalt which increases high red hardness. 135° split point for fast penetration and accurate starting without a center punch. Cobalt drills require rigidly held positive feed drilling equipment. Used to drill hard, tough metals, free machining stainless steel, titanium alloys, and certain abrasive plastics. Type 150. Manufactured to NAS 907J specifications. Made in USA.
Includes sizes: 1/16 - 1/2 by 64ths