Abstract: A fastener for securing a panel to a substructure includes a flange having a bore, a base disposed under the flange and having a post extending upwardly from the base, the post having a retaining member at an upper portion thereof, and at least one flexible hinge resiliently connecting the base and the flange such that when the base is pushed toward the flange, the post with the retaining member passes through the bore adapted to engage with other member. The flange further includes flexible walls formed around the bore and extending outward with retaining clips formed at respective leading ends thereof. The flexible walls bend towards the bore when pressed into the bore.