This 3" x 1" Thermoplastic Rubber Single Wheel Caster with Top Plate are a cost effective and adaptable caster. Presenting a heat treated ball bearing avenue and blazing zinc plated coating, these casters are optimal for light and medium duty material handling, carts, equipment, and shop projects. Wheels roll evenly with combined ball bearing composition. The thermoplastic rubber wheel functions well on nearly all surfaces, and is outstanding on hard surfaces such as concrete, tile, and wood. They will not mark, impress, or mar floor surfaces.