Precision drive sizing ensures a perfect fit with both your impact wrench and impact-wrench accessories. Ultra-reliable, heat-treated high-tensile metal eliminates the possibility of spring effect, preserving maximum operational torque, while minimizing the potential for tool failure. Adapter is designed specifically for use with air-, electric- and hydraulic-powered impact wrenches. Tool Type: Adapter/Extension; Head Type: 3/4" Drive Male -- 1" Drive Female.