This 14-piece Ribe socket bit set from US PRO Tools is designed for 1/2" drive ratchets, bars, and extensions. The set includes sockets of two different lengths: 30mm and 75mm. The 30mm sockets are for Ribe sizes 5, 6, 7, 8, 10, and 12. The 75mm sockets are for Ribe sizes 7, 8, 9, 10, 12, 13, and 14. It also comes with a 1 x 1/2" Drive x 10mm Adapter. All pieces are supplied in a durable blow-moulded storage case, making it convenient for organization and transport.