Heavy-duty molded ABS with stubs for both shallow and deep sockets. Designed to keep sockets organized, readily available for use Capable of holding 22 sockets. Capable of holding 28 sockets. SAE Sizes: 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8".