Chrome vanadium steel with mirror polish finish, preventing oil and dirt from adhering to the spanner, making for easier cleaning and preventing rust. 72-teeth ratcheting system which needs only 5? movement to operate ratchet. Thin wall design for greater | access. Conform to ASME B107.6. | | Contents | 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″ and 3/4″.