Stayput Nylon Horizontal Fastener Natural 35mm x 15mm base (4). It is designed to attach fabric to almost any solid structure. This fastener has a nickel plated brass tongue. The Stayput are for fixing fabric to a rigid structure such as a boat, building or vehicle. They will work for eyelets or grommets with approx 9.5mm inside diameter. They are best secured using a 6g countersink screw or a 3mm (1/8) pop rivet.