Metric Double Offset Ring Wrench for Working at Height Here at Secure Tools, we stock a large selection of metric double offset ring wrenches designed for safely working at height. Robust and sleek, these chrome-plated metric measurement wrenches are incredibly hard-wearing come in a huge array of sizes to suit your job’s requirements. Each individual s with a tough open ring attachment points to let you tether the item to a harness or belt, helping to prevent accidental tool drops – an especially useful feature when working at height. Furthermore, the double offset design helps you effectively and efficiently deal with difficult to access fittings across a range of industrial tasks.