OTC (4497A Ratcheting Terminal Crimper Heavy-gauge steel crimping tool designed for insulated wire terminals Ratcheting action crimps terminal to correct tightness on the wire making crimping fast and easy Insulated handles with compound mechanical leverage for power For wire sizes: AWG 22-18 0.6 millimeter-1.0 millimeter red terminal; AWG 16-14 1.3 millimeter-1.6 millimeter blue terminal; AWG 12-10 2.0 millimeter-2.6 millimeter yellow terminal