The box contains 21 1/2 sockets, measuring 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 30, and 32 mm. Universal joint 1/2, 1/2 16 and 21 mm spark plug sockets, 3/8, 1/2 square increaser, sheathed Softgrip 1/2 ratchet, and 1/2 extension.