| 摘要 |
The two arms of the socket (1) are at one end of it, and inside is a locating surface for the head of the screw (11), and a component for locking the screw to the socket. The arms have external engagement components (3). When the socket is placed in a hole (9) in a frame (10) the arms are pressed into the hole walls as the screw is tightened. |
