PRODUCT FEATURES:-  Complete hole drilling, tapping and deburring/countersinking in one operation with power drill saves labor and time -  Back tapered beyond tap toprevent thread damage from over-drilling -  Deburr/countersink also provided on bit beyond back taper -  Made from hardened high-speed steel vs. carbon steel forlonger life -  High quality hex shank to ensure strong connection to drill chuck -  Designed to tap up to 10-gauge metal -  Quick change adaptor included in both metric and standard kits