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Complete hole drilling, tapping and deburring/countersinking in one operation with power drill saves labor and timeBack tapered beyond tap toprevent thread damage from over-drillingDeburr/countersink also provided on bit beyond back taperMade from hardened high-speed steel vs. carbon steel forlonger lifeHigh quality hex shank to ensure strong connection to drill chuckDesigned to tap up to 10-gauge metalQuick change adaptor included in both metric and standard kitsMaterial : High Speed SteelMaterial thickness : Up to 10 GAMaterial type : Mild Steel, Copper, Brass, AluminumPoint Type : Split Point With Web ThinningShank : 1/4 IN Quick Change HexSize : 5/6 INThread Per Inch : 18 TPIThread Type : NC