The best wiring crimping tool available. The 300+ Crimp tool is supplied with three removable stripping/crimping dietype jaws. One for spark 7-9mm plus wires and two styles for primary wire terminals. An absolute must for making custom plug wire sets or wiring harnesses. Constructed with a heavy-duty hardened steel frame with molded non-slip hand grips. An adjustable ratchet mechanism produces consistent factory style high quality crimps.