Impact Socket Adapter, 1/2″ (female square); 3/8″ (male square) drive Impact socket adapters are used with impact sockets and impact power wrenches to tighten and loosen fasteners. They allow the drive end of an impact socket to fit an impact power wrench having a different drive size. These 1/2″ drive impact socket adapters come with a one-half inch square drive that’s compatible with drive tools of the same size.
