A splayable fastening device (10) comprises a fastener engagable element (12) having a screw-threaded element, at least one flexibly springable arm member (14) which is at least in part wrapable about a screw-threaded axis of the screw-threaded element, and a retainer (18) for retaining the said flexibly springable arm member (14) in its wrapped or coiled condition. The retainer (18) is movable relative to the flexibly springable arm member whereby the flexibly springable arm member (14) is unfurlable in a clockwise or anticlockwise direction. A method of fastening to a hollow wall using such a splayable fastening device (10) is also provided.
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