Abstract: The invention relates to a resilient plastics retaining sleeve for a stud assembly of a quick release fastener for holding a panel on a support member and consisting of two parts, a stud and a retaining member or receptacle. The sleeve comprises a substantially cylindrical portion having at one end an inwardly directed annular lip and at its other end a shoulder. A pair of legs extends in the general direction of the sleeve axis and each of the legs includes at its free end an outwardly directed flange so that, in use, the legs may be brought together and inserted through an aperture in a panel on which the sleeve is to be mounted. The legs spring outwards again after its insertion due to their resilience and the leg flanges then engage the rear surface of the panel to retain the sleeve thereon and the shoulder engages the front surface of the panel to prevent the cylindrical portion of the sleeve passing through the aperture.