A complete 44-piece professional socket set, the Sunex Pit Pro PT9544 includes 1/4 inch sockets ranging from 4 mm to 13 mm (5/32 inch - 1/2 inch), 3/8 inch sockets 10 mm to 19mm (3/8 inch to 13/16 inch). The kit also includes a 5/8 and 13/6 inch spark socket, as well as 16 and 3 inch extensions in a solid plastic carrying case.