DEWALT Drill Tap Bit 1/4" - 20 UNC ( DWADT1420 ) pack of 3 ( see our photo for details ) Technical Specs ItemCombination Drill and Tap Material - MachiningHigh Speed Steel Finish - MachiningBright (Uncoated) Thread Size1/4"-20 Thread StandardUNC Overall Length2 9/32 in Coolant FedNon-Coolant Through Impact RatedYes Size1/4"-20 Thread DirectionRight Hand These combination tools drill a hole and create threads in the hole in one pass. They also create a countersink at the top of the hole that allows a screw to sit flush with the top of the hole and helps prevent the workpiece material from swelling when the screw is inserted in the hole and tightened down. These combination drills, taps, and countersinks are made from high-speed steel and provide good wear resistance in general purpose applications in a range of materials, including ferrous and nonferrous metals. Material High Speed Steel Shank Type Hex Brand DEWALT Item Dimensions LxWxH 1.87 x 0.25 x 5.75 inches About this item Drills and taps hole in one application Deburr and countersink in one step Hex shank of drill bit - Designed for Impact Drivers Speed Tip - Drills material quickly