The Network Crimping Pliers Tu-N5684R Tni-U Pass-through 6-in-1 Modular Crimper is designed to crimp RJ11, RJ12 and RJ45 connectors onto CAT3, CAT5/5E and CAT6 cables. It has a pass-through design to make it very easy to crimp RJ45 connectors without any measuring needed. This tool crimps 4, 6 and 8 position modular connectors (RJ11/12 and RJ45) and cleanly trims the wires flush to the end face of the connectors, plus it trims off the end wires. It is the perfect crimping tool for any network installer or maintenance technician. This crimping tool is intended for use with our RJ45 Pass-Through connectors for CAT5 and CAT6 cables: part no. RJ45-5100 and RJ45-6100. This product is designed for lifetime use as Network Crimping Pliers Tu-N5684R Tni-U makes high-quality tools that are Made for Life.