A multi-function integrally molded plastic fastener for insertion within a hole in a wall for fastening objects to any of solid, thick or thin hollow walls. The fastener comprises a base element and an anchoring element with the base element being positioned within the hole and depending whether the wall is solid, thick or thin hollow wall, the anchoring element is positioned totally within, partially within and totally behind the wall respectively. The anchoring element is comprised of outstretched anchoring arms which are collapsible for insertion within the hole and which arms have interfitting sections of a sinusoidal wave configuration to minimize the cross section of the anchoring element and the width required for the hole. The ends of the arms, spaced from the base element, engage an external fastening member thereby providing a solid anchorage in any of a solid, thick or thin hollow wall.