Insulated Adjustable Wrenches for Working at Height Secure Tools provide a wide selection of insulated adjustable wrenches for working at height. Available in a range of sizes, adjustable wrenches let you turn or loosen nuts and bolts of different sizes easily and quickly. Manufactured using only the highest-quality materials, our insulated adjustable wrenches are robust and built to give decades of effective use – even in tough work environments. Furthermore, the inclusion of top-grade insulation can protect again electric shock and arcing up to 10,000 volts. Plus, each insulated adjustable wrench has a solid open ring attachment point too, giving a secure place to tether the tool to your harness and prevent accidental droppages when working from height.