Dekcell RJ45/RJ12/RJ11 Crimping Tool with Wire Stripper and Cutter This handy crimping tool allows you to crimp, cut, and strip 8P8C/RJ-45, 6P6C/RJ-12, 6P4C/RJ-11 Plugs. For terminating a RJ45 plug with a stranded, four-pair, unshielded, twisted-pair cable, making a patch cable assembly. For terminating a RJ12 or RJ11 plug with a three-pair or two-pair, unshielded phone cable.