Imperial Offset Insulated Ring Wrenches for Working at Height Secure Tools provide a wide selection of imperial offset insulated ring wrenches for working at height. Available in a range of imperial measurement sizes, offset ring wrenches feature a bend on each end, helping you reach sunken nuts or bolts easily. Manufactured using only the highest-quality materials, our offset ring wrenches are tough and built to give decades of hard-wearing use – even in tough work environments. Furthermore, the inclusion of top-grade insulation means you’re protected against electric shock and arcing up to 10,000 volts. Plus, each insulated offset insulated ring wrench comes with a fitted solid open ring attachment point too, giving you a secure place to tether the tool to your harness and prevent accidental droppages when working from height.