Features: Taps and dies are tools used to create threads in all kinds of metalworking projects. The tap is used to cut or form a thread on the inside surface of a hole, which effectively creates a nut, while an awl is used to cut or form matching bolts. Both tools can also be used with cutting oil to clean dirty, rusty or worn threads of old nuts and bolts, for example car spark plug threads, which often suffer from corrosion and buildup. of carbon. Manufactured from high quality alloy steel, these taps and dies, with precise use and cutting oils, will tap and thread typical metals such as carbon and alloy steel, cast iron, aluminum, brass and bronze. Three and four flute taps and dies with coarse and fine tapered threads. Sharp edges help align and start the tap in an untapped hole. Cutting new material or chasing slightly damaged threads, such as old screws, spark plugs, nuts and bolts affected by rust. Wrench handles hold faucet and parts firmly. Countersunk ends of adjustable tap