Universal Adapters, 3/8 in (female square), 3/8 in (male square) drive, 2 1/8 in

Apex® square drive universal adapters have hex tolerances that are on average 48% tighter than DIN and 35% tighter than ANSI requirements. With Apex® you are assured of an exact, sure fit. All Apex® square drive adapters have the tightest tolerances for straightness and concentricity in the industry.