Gator Grip King Socket The Original Professional Grade Self-Adjusting Universal Socket with over 450FT Pounds of Power. Self-Adjusts for shape and size as well as Standard and Metric Application 1/2" Drive professional grade socket. Self-adjusts for all shapes and size fastener, except a perfectly round head, just file an edge. Self-adjusts from 7/16 to 1  Standard and 11mm -32mm Metric. Works well on rusted and damaged heads Has a torque of over 450 LB/FT of power Works on a power drill (adapter not included) Replaces a toolbox full of tools and so easy to use. Not only for the tradesman, everyone can use it.