3/8-Inch Hex Insulated Nut Driver with 6-Inch Hollow Shaft and Cushion Grip Handle Klein Tools 646-3/8-INS 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