This high-precision wire ferrule crimper features a built-in ratchet that applies correct pressure to ensure a complete crimp every time and the safety release function allows you to stop a faulty crimp before the crimping cycle is complete. The precisely milled, hardened steel dies have individual square crimping slots for each wire size from 22 to 12 AWG. The dies can easily be changed using a slotted screwdriver. The durable ABS grips make this tool comfortable and easy to use.