A set of 20 pieces of 1/2 inch 12-point socket heads: 1/4 inch 5/16 inch 3/8 inch 7/16 inch 1/2 inch 9/16 inch 19/32 inch 5/8 inch 11/16 inch 3/4 inch 25/32 inch 13/16 inch 7/8 inch 15/16 inch 31/32 inch 1 inch 1-1/16 inch 1-1/8 inch 1-3/16 inch 1-1/4 inch Two extension bars: 5 inches (125 mm) 10 inches (250 mm) One universal swivel joint One 13/16 inch 6-point spark plug socket head One 10 inch (254 mm) T-sliding bar One Flip-Drive ratchet wrench