Wera Tools - 8790 C Wheel Impaktor Socket with 1/2" driveImpaktor socket, "", for use with impact wrenches, with rotating smooth plastic sleeve for higher working speed, better accuracy during screwdriving and additional rim protection. Features For use with electric or pneumatic impact wrenches with 12. 5mm = "" drive Robust Impaktor design for extremely high stresses Smooth outer plastic sleeve to protect the rim when changing wheels Internal plastic insert to protect the wheel bolt surface Hexagonal