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KAVOL Cobalt Jobber Length Twist Drill Bit Set include three variations, 13pcs/21pcs/29pcs. Cobalt high-speed steel drill bits with gold oxide finish. Cobalt steel provides extended tool life compared to common high-speed steel drill bits, and maintains the tool's toughness and hardness in high drilling temperatures. A gold oxide finish acts as a lubricant and provides wear resistance. The set comes in a metal index case with labeled compartments for identification and organization., HSS Bits M-42 and Metal Storage Case for Drilling Metal, Wood and Plastics ,by KAVOL Sizes: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64", 3/8", 25/64", 13/32", 27/64", 7/16", 29/64", 15/32", 31/64", 1/2" Kavol, the drill bit expert which specialized in heavy-duty drill bits. This M42 Cobalt High Speed Steel drill bit set is designed for hard metals such as stainless steel, cast iron, and any other softer materials. Contains 8% cobalt HSS. It's not recommended to use to masonry or concrete.