Designed and patented in Europe and already a huge seller there. The innovative design of the Line Wrench is a must have for any professional mechanic. The Line Wrench makes fast work of troublesome fittings. Imperial Set of 4 – includes: LW51638FLEX, LW71612FLEX, LW91658FLEX, LW111634FLEX. Features – Unique patented ratcheting function – Open and close wrench head with single-handed operation – Fits completely around the hex of the nut – Works on rounded and corroded tube nuts – More pressure applied to tool makes for tighter grip on nut – SAE and metric sets available, as well as individual – Double-ended wrenches or open-end on opposite side.