Feature: Premium QualityMade of high-speed steel, they own great hardness and are not easy to rust, and resistant to corrosion and wear.High EfficiencySpiral groove design helps clear chips and particles faster to prevent clogging, reduce heat accumulation and improve working efficiency.Combo Set of 8 PCSThis set includes 8 different sizes of drill bits --- 9/16in, 5/8in, 11/16in, 3/4in, 13/16in, 7/8in, 15/16in, 1in, and their shank diameter are the same --- 1/2in.Applicable MaterialYou can use it on wood, plastic, copper, aluminium alloy, stainless steel, etc.Wide Compatibility1/2'' round reduced shank allows use with a wide variety of tool-holding systems like corded drill, cordless drill, benchtop drill and magnetic drill, etc.Specification:Material: Stainless SteelShank diameter: 1/2in (12.7mm)Cutting edge diameter: 9/16in, 5/8in, 11/16in, 3/4in, 13/16in, 7/8in, 15/16in, 1inTotal length: 6inQuantity: 8PcsPacing list: 8 * Reduced Shank Drill Bit Set