The Ascot Supply 12-pc Tap & Die Set for Wheel Studs & Nuts, No. 319-00012, features taps for machining internal threads and dies for external threads, and it includes a screw pitch gauge that allows for quick measurement of thread pitch or lead. The set includes four dies, four taps, a tap holder, a die socket, a screw pitch gauge, and a 1/2" drive 25mm socket with a C-ring, all of which are organized in a blow-molded case. The holders enable direct use on built-in wheel studs that are still on the vehicle.