This 12-piece set includes four 6-point and four 12-point sockets. 6-point socket sizes include 3/8-Inch, 7/16-Inch, 1/2-Inch and 9/16-Inch. The four 12-point sockets span 5/8-Inch, 11/16-Inch, 3/4-Inch and 13/16-Inch sizes. Also, includes a 5/8-Inch spark plug socket,two extensions and a ratchet. Keep all of pieces together in a compact hinged metal box.