The ITL Insulated Adjustable Wrenches with injection moulded nylon 11 handles which exceed the requirements of IEC 60900 the industry standard for live line working In addition these tools meet the requirements of Category C which requires them to perform at extreme temperatures of -40°C to +70°C making them unique in this category These insulated tools are the toughest in the market being virtually indestructible With a lifetime warranty on the tool and insulation plus a 30 day no quibble money back guarantee