FeaturesComplete hole drilling, tapping and deburring/countersinking in one operation with power drill saves labor and timeBack tapered beyond tap to prevent thread damage from over-drillingDeburr/countersink also provided on bit beyond back taperMade from hardened high speed steel vs carbon steel for longer lifeHigh quality hex shank to ensure strong connection to drill chuckDesigned to tap up to 10 ga metalQuick change adaptor included in both metric and standard kits