Set consists of the following pieces: Four 6 point sockets: 3/8″, 7/16″, 1/2″, and 9/16″. Four 12 point sockets: 5/8″, 11/16″, 3/4″, and 13/16″. Once spark plug socket: 5/8″. Two extensions: 1 3/4″ and 6″ long. One ratchet. Hinged metal box.