Made to ANSI specifications Chrome molybdenum steel, black oxide finish Z-Drive sockets grip and turn flat surfaces of fasteners for reduced rounding Socket center holes are punched through to add a bit more clearance for taller nuts and bolts. Packaged in a blow molded storage case Imperial Standard Includes 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″, 15/16″, 1″
