A ceiling hook (H) comprises a fastener (F) for anchoring in a support structure, and a locking ring in the form of an anti-rotation washer (W). The washer (W) includes anchoring teeth (34) for stationarily mounting the washer (W) to the ceiling. The hook member (12) and the washer (W) comprise co-operating locking ratchet elements (22, 28) for locking the fastener (F) to the washer (W) and thus preventing the fastener (F) from loosening from the ceiling. The washer (W) defines at a central opening (30) thereof at least one notch (32) with the fastener (F) defining at least one tab with (26), the notch (32) being slidable through the tab (26) for mounting the washer (W) to the fastener (F) and then allowing it to rotate between the tab (26) and the hook member (12), whereby the washer (W) is prevented from being removed from the fastener (F) unless the tab (26) and notch (32) are aligned.
