5/8'' Hollow-Shaft Nut Drivers. Individually tested to exceed the IEC 60900 and ASTM F1505 standards, for insulated tools, and clearly marked with the official 1000-volt rating symbol. Two layers of insulation provide protection against electric shock. Thick, exceptionally tough, high-dielectric white inner coating is bonded to the tool. A flame retardant, impact-resistant, bright orange outer coating. Hollow shafts make it possible to work on stacked circuit boards or other long bolt applications. Tip-Ident quickly identifies nut driver size. Cushion-Grip handles for greater torque and comfort.