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 1,000V. Two layers of insulation provide protection against electric shock. Clearly marked with the official 1,000V rating symbol. Round shank with square-recess tip. Klein® 661-4-INS Cushion-Grip™ Insulated Screwdriver, #1 Square, Green, 4 in Round Shank