This 6" x 2" round tread thermoplastic rubber heavy duty swivel caster with total lock brake provides smooth and quiet operation. The crowned tread provides provides easy starts and steering. 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.