A socket is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port number so that the TCP layer can identify the application that data is destined to be sent to. An endpoint is a combination of an IP address and a port number. This set contains 1 x 1/4 inch Stanley p9 ratchet, 2 x 1/4 inch extensions : 50 and 100mm, 1 x 1/4 inch universal joint, 1 x 3/8 inch to 1/4 inch coupler, 1 x 1/4 inch bit holder, 1 x 1/4 inch spinner handle, 1 x 1/4 inch magnetic pick up socket, 22 x 1/4 inch bits, 13 x 1/4 inch 6 pt, standard socket : 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13 and 14 mm. For additional information regarding the product, please contact with dubuy support team.