Metric Insulated Hex Key Wrench Secure Tools offer a wide selection of insulated metric hex key wrenches to use in a variety of construction industry tasks. Available in a range of metric measurement sizes, you can use a hex key wrench to drive bolt and screws with a hexagonal socket Comprised of top-quality robust 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 wrench includes a useful open ring attachment point, letting you tether the item to your harness to avert tool droppages in the workplace.