High-carbon Steel Construction – Crimping dies are precision ground from high-carbon steel. Product Features: RJ45 Crimp Tool Modular Crimping RJ11 RJ12 Connector Plug Tool, Cat5 Phone Ethernet Network 3 In 1 Professional Crimper Steel, RJ-45 RJ-12 RJ-11 Line Cord Cutter 6 – 8 Conductor Cable Stripper.