Double Ended Swivel Wrench Sets for Working at Height Here at Secure Tools, we provide a collection of strong and hard-wearing double-ended swivel wrench sets designed for safely and effectively working at height. The perfect tool to use across hundreds of industrial tasks, our double-ended swivel wrench sets are effective in tightening or loosening nuts and fittings at hard to reach angles. And their tough design makes them usable throughout even the harshest of working conditions. Furthermore, each double-ended wrench in the set includes a handy open ring attachment point so you can tether it securely to a belt or harness – perfect for preventing tool drops when working at height.