Insulated hand tools from Jameson provide maximum electrical protection and are suitable for working live or close to live parts at nominal voltages up to 1,000 volts. The JT-WR-07017 from Jameson is constructed using heavy-duty injection molded Nylon 11, Fully-Insulated Ratcheting Box Wrenches are ideal for use in a wide variety of utility, electrical, and telecommunication applications. The 72-tooth ratchet ring and gear meets DIN: HRC39-45 torque specifications and produces a 5-degree rotation allowing it to function in tight spaces.