Designed to crimp MC4 connectors onto 14, 12, or 10 AWG (2.5 / 4.0 / 6 mm2) solar panel wire, this crimper is the perfect tool for installing and maintaining solar panel connectors. This crimper features the following: Parallel jaws with adjustable pressure-regulating gear and self-locking design crimp solar panel connectors perfectly every time Built-in ratchet makes crimping quick and easy Made of hardened carbon steel with a black oxide finish for strength and durability Dual component grip provides greater comfort and ergonomics Able to crimp MC3 connectors using an MC3 die (SPD-MC3), sold separately