This 3/8" Sq. Dr. Combined MM/AF socket set includes 12-point sockets made from chrome vanadium steel that is hardened and tempered with a polished finish. Each socket has a cross knurl and three groove design for extra grip. Includes a 72-tooth reversible ratchet and accessories. Supplied inside a sturdy storage case. This set contains 17 Metric sockets (6-22mm), 4 Metric deep sockets (8-13mm), 9 Imperial sockets (1/4"" - 3/4"" ), 3 Spark plug sockets (10-14mm), a 72-tooth reversible ratchet with quick release, and 3 wobble extension bars (75, 150, 250mm).