A four-piece set of socket drive adapters. A drive adapter carries a female square on one end and a male square of a different size on the other: the female square fits onto the drive lug of a ratchet or extension and the male square accepts sockets, so one ratchet can turn sockets from the other drive size.

• 4-piece set
• Each adapter joins one drive size to another
• Lets one ratchet turn sockets of a drive size it was not made for