Imperial Insulated Hex Key Wrench Secure Tools offer a wide selection of imperial metric hex key wrenches to use in a variety of construction industry tasks. Available in a range of imperial measurement sizes, you can use a hex key wrench to easily drive bolt and screws with hexagonal sockets. Built using top-quality materials, these insulated hex key wrenches are hard-wearing and very effective in protecting against electric shock and arcing up to 10,000 volts. And to further increase safety, each imperial insulated hex key wrench includes a durable open ring attachment point, letting you tether the item to your harness to avert tool droppages in the workplace.