Abstract: A blind fastener for insertion through an aperture in a workpiece, the fastener comprising a pin (11), a sleeve (21) and an abutment member (32); the pin (11) extending inside the sleeve (21) and engaging therewith at or near a first end (24) of the sleeve; the sleeve having a radially expandable portion; the abutment member (32) being adjacent the second end (25) of the sleeve and projecting radially therefrom and the pin (11) extending beyond the abutment member (32); in which the abutment member is removably secured to the sleeve by means sufficiently strong to allow handling of the assembled fastener to be inserted in the aperture in the workpiece and installed therein, but sufficiently weak to allow the abutment member to be removed from the sleeve so that the pin and sleeve can be forced out of the aperture on the workpiece, to remove the fastener therefrom.