| 摘要 |
The invention provides a fastener (10) comprising a shank (11) which terminates in a head formation (12) at one end thereof, the head formation having an outer engagement profile (13) which is adapted to be engaged by drive means to rotate the fastener, and a blind socket (15) whereof the inner surface has an inner engagement profile (14) which is adapted to be engaged by a spigot-type drive means for rotating the fastener, the socket formation terminating in a concave profile at its remote end (15a).
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