This 4" x 2" rubber on cast iron heavy duty swivel caster with cam brake is an economical, quiet wheel ideal for use on platform trucks or stock dollies. Our 45 Series is an economical lineup of casters and wheels designed for a range of applications with load requirements ranging from 300 to 1,250 pounds per caster. From shop carts to containers, to platform and lumber carts the 45 Series is the most competitive and in-stock 2" wide solution.