This is a vintage PROTO ® socket set manufactured in the United States. It includes 30 pieces of sockets, extensions, universal joint swivel, and an 8" breaker bar. The set comes in a metal case and features both 12-point and 6-point drive types with a surface finish of chrome. The drive size is 3/8in. and 1/4in. The socket sizes range from 3/16in. to 11/16in. and the set is measured in SAE.