The C.K 430021 Crimping Pliers for Insulated Terminals are designed for the safe and secure crimping of red, blue or yellow insulated terminals. Designed for the safe and secure crimping of red, blue or yellow insulated terminals. Heavy duty body construction with hardened steel jaws, guaranteed for up to 30,000 cycles. Factory set crimp pressures for the optimum connection safety. Full cycle ratchet mechanism for safe, repeatable results and comfortable ergonomic handles.