Convenience of Cordless. Power of Air. The W7150 1/2″ 20V High-Torque Impactool™ is the only cordless impact wrench that can perform pound-for-pound with our best-in-class 2135TiMAX, 1/2″ air Impactool, the W7150 cordless impact wrench will make quick work of tough jobs that professional technicians do every day.