a reusable plastic fastener has an elongated shank having two flexible curved flanges secured thereto and a head secured to a central portion of the shank . the flanges are secured at a leading edge to the central portion and curve away to terminate in a trailing edge that is unsupported between a distal end and a base of the central portion . a top edge of each of the flanges is secured to the head of the fastener by a tab . the exterior of the flexible flanges extends outwardly away from the central portion beginning at the distal end of the central portion and is angled back in towards the central portion near the base of the central portion so as to form a shoulder between the flexible flanges and the head of the fastener . the central portion of the shank has at least one cored - out section .