Deep ribbed design. Heat-treated and tempered shank. Handle resists slippage. Accurate fit and more torque without slippage. Handle resists oil, gas, and water. Profilated tip for a more consistent geometric symmetry. Clearly marked with the official 1000-volt rating symbol. Two layers of insulation provide protection against electric shock. Klein insulated tools exceed IEC 60900 and ASTM F1505 standards for insulated tools. Individually tested to exceed standards.