Imperial Double Offset Ring Wrenches For Working at Height Here at Secure Tools, we have a large selection of imperial double offset ring wrenches designed for working at height safely. Incredibly strong and hard-wearing, these sleek, chrome-plated imperial measurement wrenches are built to last and come in a huge array of sizes to suit your job’s requirements. Each wrench comes with a convenient open ring attachment point to let you tether the it to a harness or belt, helping to stop accidental tool drops – an especially practical feature when working at height. Moreover, the double offset design helps you quickly and efficiently deal with hard to access fittings across a range of industrial tasks.