This is an original replacement part manufactured for use with outdoor grills. The caster can pivot, and has a lock lever to prevent it from rolling once in place. There is a plastic bracket that the caster mounts to, and the bracket is available separately, the caster is sold individually.
This is an authentic replacement part sourced directly from the manufacturer. The axle is commonly found in grills from Broil-Mate, Huntington, and Sterling. This part is made of metal, and is used to hold the wheels and allow them to spin easily. This item is available as an individual replacement part.