| 摘要 |
A fastener comprises a shank (10) for extending through an opening (60) from a near side (56) to a far side (58) of a wall and a catch (20) retained in the shank of the fastener, in which the catch has first and second orientations in which, respectively, it projects less and more beyond the profile of the shank, whereby the catch can pass through the opening in the first orientation but the catch enggages the far side of the wall and prevents withdrawal of the shank from the opening in the second orientation, the catch being supported by a shoulder (42) when the shank is tensioned by a nut (50). Swivelling of the catch is controlled by rotation of the shank.
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