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specifications:13pcs Hex drill bit set:1/16", 564", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4",1 pc each with reusable packaging. Product Feature: Material:HSS,Titanium CoatingAngle Point:135 DegreeShank Type:Hex ShankHardness:60-63 RockwellApplication: 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!