This 4" x 2" cast iron heavy duty swivel caster offers high capacity at a lower price. Cast iron wheels are ideal for heavy loads in industrial environments. 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.