The Pro-Crimp features interchangeable jaws allowing for a variety of different style crimps with one heavy-duty tool. If you frequently make plug wires or do a lot of custom wiring, the Pro-Crimp Tool is a must for your toolbox. The Pro-Crimp features a hardened steel frame with comfortable molded hand grips. The slick ratchet action provides secure, factory quality crimps every time. The Tool is supplied with precision crimping/stripping jaws for MSD's spark plug wire terminals.