Klein insulated tools combine excellent functionality along with reduction of risk of injury where a tool might make contact with an energized source with voltage up to 1000 volts. Two layers of insulation provide protection against electric shock. Clearly marked with the official 1000-volt rating symbol. Round shank with square-recess tip.PRODUCT FEATURES:- 1000V rated for safety - Durable flame-retardant, molded dual-layer insulation meets or exceeds all ASTM and IEC standards for insulated tools - Cushion-Grip handle for greater torque and comfort - Custom US-made steel tool - Made in the USA - This item replaces the 666-INS