Cutting edges induction-hardened (64 HRC) and factory tested. Designed to cut piano wire and other solid wire with minimum effort. Exceptional cutting performance through lever action. KN7111: with spring assisted action and handle lock. KN7131: a recess on the blade near the joint makes it easier to cut wires with a diameter of 4mm, such as those used in ceiling suspension systems.SEPTLS4147131200. TLS4147131200. Knipex Knipex Compact Lever Action Bolt Cutters - 7131200.