Fits SAE or metric size fasteners Small total socket replaces up to 12 large and 14 small size sockets Double-speed size adjustment Large: adjusts from 3/16 in. to 1-1/16 in. (5 mm to 27 mm) Small: adjusts from 3/16 in. to 5/8 in. (5 mm to 16 mm) Lower profile to allow access in hard to reach spaces