Abstract: A fastener for mounting elongated material, such as cables and wires, to a supporting structure includes a major body portion having an aperture for receiving elongated materials of various dimensions, and at least one anchor bore through which an anchor is inserted for securing the fastener to the supporting structure. The fastener also includes a prong that is engagable with the anchor for preventing the major body portion from slipping off the anchor. The fastener may include a flexible base member for receiving the elongated material, or the fastener may includes a wire tie slot through which a wire tie can be passed for holding multiple pieces of material in position. The method of installing the fastener includes securing the anchor to the supporting structure, and then sliding the major body portion, with the elongated material positioned within the aperture, onto the anchor.