ITEM NAME:Mixed Car Door Panel Trim Fenders Bumper Rivet Retainer Push Pin HOT NEW M4L0 Description&Preview.These rivet fasteners are made of nylon material, suitable for car use. Car's good accessory, commonly used for fitting side skirts, bumpers and other trim. Type: Fastener Clip. They can be used on buses, trains, planes, truck, caravans and cars.