Aeroflow XPRO ignition lead crimping tool is perfect for helping you make professional quality crimps when assembling your ignition leads. The ratcheting crimp design steel jaws are designed with an adjustable crimping compression mechanism to help produce a consistent, factory-style crimp every time. This makes it great for DIY users or hardcore racers that frequently make plug wires or custom wiring. Featuring a hardened steel frame with comfortable molded hand grips for comfortable use. Standard jaws are to suit 8.5mm (11/32") leads. Optional jaws are available to suit insulated and non-insulated electrical terminals for auto electrical applications.