This Teng Tools tap and die set is ideal for repairing screw threads Taps cut a thread on the inside surface of a hole creating a female surface which functions like a nut Dies on the other hand cut a thread on a preformed cylindrical rod which creates a male threaded piece which functions like a bolt This 17-piece set contains 7 metric taps and dies of each dimension a tap wrench a die stock and a screw pitch gauge The tools are supplied in a handy storage tray The TTTD17 tap and die set contains the following 7 x Metric dies 3 x 05mm 4 x 07mm 5 x 08mm 6 x 10mm 8 x 125mm 10 x 15mm and 12 x 175mm 7 x Metric taps 3 4 5 6 8 10 and 12mm 1 x Tap handle capacity 3 to 12mm 1 x Die handle with adjustment screw capacity 3 to 12mm 1 x Screw pitch gauge