Insulated Tool Series is tested to 10,000 Vac and rated for 1,000 Vac max exposure and promotes safety when working around electricity. Combination Tool has wall drive profile that distributes torque load to fastener through flats, optimizing area of force application as well as lowering possibility of distortion to nut or bolt head. Capable of exceeding tightening torques specified in DIN standard by 70 to 100%, each socket or spanner fits metric and inch fastener.