Tap and dies are tools used to create threads on all types of metalworking projects. The tap is used to cut or form a thread on the inside surface of a hole, effectively creating a nut, while a hole punch is used to cut or form mating screws. Both tools can also be used with cutting oil to clean dirty, rusty threads or worn old nuts and bolts, for example the threads of car spark plugs, which often suffer from corrosion and carbon deposits. Made from a high quality steel alloy, these taps and dies, with precise use and cutting oils, can thread and cut typical metals such as carbon and alloy steel, as well as cast iron, aluminum, brass and bronze. < p>Three and four flute thread cutters with coarse and fine tapered wires. Sharp edges help align and start the tap in an undrilled hole. Cut new material or easily drive out damaged threads, such as old screws, spark plugs, nuts and bolts affected by rust. Wrench handles hold taps and workpieces securely. Mached ends of the adjustable tap