Metric Double Ended Swivel Wrench for Working at Height We stock a range of hard-wearing metric double-ended swivel wrenches for safely working at height. The perfect accessory to use across a wealth of trade tasks, including rigging and general DIY, our metric measurement double ended swivel wrenches are effective in tightening or loosening nuts and fittings at hard to access angles. Furthermore, each double-ended swivel wrench in the set includes a handy open ring attachment point to let you safely tether it to a belt or harness – ideal for preventing tool drops when working at height. And their tough design means they are sure to keep working through the harshest of working conditions.