Cementex 1/4 in T-Handle Hexagon Wrench, 6 in - IHK-140Cementex 1 4 in T Handle Hexagon Wrench, 6 in IHK 140 A hex wrench, also known as an Allen wrench or hex key, is a hand tool used to drive bolts and screws with hexagonal sockets or heads. Hex wrenches have a hexagonal shaped tip at one end that fits into the corresponding hexagonal socket or recessed head of the fastener. Specifications: Country of Origin: United States of America