RJ11 and RJ45 Crimping tool. Three ways modular tool for crimping, cutting and stripping. Suitable for telephone, LAN cable and jack crimping. For: 8P8C/ RJ-45 computer network cable For: 6P4C/RJ-11, 6P2C phone cable Crimping Tool for RJ11 / RJ45. This device is used to crimp RJ11 phone connectors and RJ45 Ethernet connectors onto cables.