Marcy's Marvelous Wheel Chocks, Fits Up to 5" Wheels, from Sullivan

Marcy's marvelous wheel chocks help conserve space in trailers and trucks, prevent planes from rolling during transport. Can be mounted on wall to hang planes for storage. Keeps tires from flat spotting. Works on all type planes, taildraggers or nose wheel with or without wheel pants. Fits up to 5" diameter tires. Packaged with mounting screws.