Ingersoll Rand S64M17L-PS1 17mm Power Socket Unlike traditional sockets, the Power Socket gives your existing  impact tool up to 50% more torque. Unique design loosens hard-to-remove fasteners, bolts, and lug nuts fast Lightweight and compact design makes it ideal for applications that usually require a larger impact tool or a breaker bar Available in a variety of metric and SAE sizes to meet standard bolt and lug nut variations Fits directly on the square drive of a half-inch impact tool