Complete hole drilling, tapping and deburring/countersinking in one operation using power drill to save time and labor Back tapered beyond tap to prevent thread damage from over-drilling Power tool accessory made from hardened high-speed steel versus carbon-steel for longer life High quality hex shank to ensure strong connection to drill chuck Designed to tap up to 10 gauge metal Quick change adaptor included Specifications Material High speed steel Application For mild steel, copper, brass and aluminum Point Type Split point with web thinning Size 6 piece, 6-32 to 1/4-20