Drill America 6 Piece Combined Drill And Tap (Drap) Set (#6-32,, 20), Dwt Series Drill America dwt series combined drill and Tap is designed to drill and Tap in one operation. Can be used on multi-spindle or hand held operations. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge. Round shanks allow use with a wide variety of tool holding systems . When run in a counterclockwise direction (right-hand cut) spiral FLUTED tools evacuate chips up and out of the cut to reduce clogging. Sizes included are: #6-32, #8-32, #10-32, #10-24, #12-24. 1/4"-20 Comes in plastic case with hex holder 6 Piece HSS, Combined Drill Tap Set High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge