The ASTROTEK RJ12/RJ11/RJ45 Crimping Tool with Ratchetelps you to terminate a plug with a stranded four-pair, unshielded, twisted-pair cable.you can crimp, cut, and strip with one convenient tool. Crimping tools are used to attach the RJ45 (8P/RJ45 & 6P/RJ12, RJ11) connector to the Ethernet cables. • Modular crimping tool • Built-in cable cutter • Built-in cable stripper with stop to ensure correct strip length • crimping modular plug: 8P/RJ 45, 6P/RJ12, 6P4C/RJ11