Made of Heavy-Duty Rugged Carbon Hardened Steel Construction. High-quality hardened steel with black oxide finish resists rusting,durable plastic handle control the tension of the tool needs less strength easy to operate 3 in 1 Cable Connectors Crimper Tool Portable style with perfect shape.The mouth of the press-pliers is made of steel, which is hard and durable.It won't damage the shelled-wire and work convieniently with high efficiency.While using press-pliers, just insert the modular plug into its position and press it Fast, reliable crimp tool with steel body for durability with ergonomic comfort grips less strength easy to operate Cuts strips and crimps Twisted Pair, Ethernet RJ45 voice and data cables Crimps 4P 6P and 8P position modular connectors ( RJ11/RJ12/RJ45) Mini cable punch down stripper wire jacket cutter made of High quality SK manganese steel 110 blade, sharp wear, stripping easy and accurate, and it does not hurt wire core,thick lines, thin lines can be easily