Cleanly Cut and Strip Both Flat Modular and Round Network Cables This RJ11/RJ12/RJ45 crimper is perfect for cable installers who want to save time when tackling large-scale projects. It allows you to cut and strip LAN cables up to 12 mm in diameter easily and efficiently. Its embedded blades strip flat modular and round network cables such as Cat5/5e and Cat6. Terminate 4-Wire RJ11, 6-Wire RJ12 and 8-Wire RJ45 Modular Plugs Terminating 4-wire RJ11 (4P4C), 6-wire RJ12 (6P6C) and 8-wire RJ45 (8P8C) modular plugs is easy. Insert your wired plug into the appropriate slot and squeeze the handles to crimp. The handles have non-slip grips and are ergonomically designed for comfort. Immediately Test or Debug Newly Crimped or Existing In-Wall Network or Telecom Cables This multifunctional tool comes with a built-in UTP/STP tester to help you quickly and accurately identify wiring faults in newly crimped or existing in-wall LAN cables up to 600 feet (183 meters). LEDs indicate if your LAN cable has a Short, a Miswire, a Reversal Wiring or Split Pairs so you can pinpoint the specific wiring problem as well as its location. The tester also includes a Debug mode that allows you to identify which cable pairs have a wiring fault. Best of all, this multipurpose tool comes with a remote unit that detaches from the handle so you can check installed cables almost anywhere. Perfect for Creating Custom-Designed Cables The RJ11/RJ12/RJ45 Wire Crimper with Tester lets you decide how long your network cables should be and what plug they should use. Rather than wait for a custom order, you can create your own network cables and test them right away. One-Year Warranty The T100-001-TST is backed by a one-year limited warranty, ensuring reliability and performance.