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specifications: 21pcs Hex drill bit set: 1/16X2,5/64X2,3/32X2,7/64X2,1/8X2,9/64,5/32,11/64,3/16,13/64,7/32,15/64,1/4,5/16,3/8,1/2 Product Feature: Material:HSS,Titanium Coating Angle Point:135 Degree Shank Type:Hex Shank Hardness:60-63 Rockwell Application: widely used in metal,wood,plastic,aluminium alloy from repair work, automative,and even construction use. Instructions: simply insert drills to 1/4" quick change chucks or power tools. Precautions: Make sure to put on masks and gloves before drilling. Keep cool or discontinuous use will largely prolong drill life. High performace and reliable quality to be promised by INTOO!