Designed for the safe and secure attachment of modular plugs without die changes. The C.K ratchet crimping pliers feature: Heavy duty body construction with hardened steel jaws - guaranteed for up to 30,000 cycles. Factory set crimp pressures for the optimum connection safety. Built in wire stripper/cutter mechanism. Full cycle ratchet mechanism for safe, repeatable results and comfortable ergonomic handles. Suitable for plugs type 8P8C (RJ-45) 6P6C (RJ-12) and 6P4C (RJ-11)