Swivel industrial medium-heavy duty caster. Polypropylene wheels give easy mobility to heavy loads on smooth hard surfaces. The wheels are nonmarking, light in weight, and have high-impact strength. They resist water and chemical absorption. The body of the caster is made of welded 3/16" steel. The double ball bearing raceways promote easy swivel motion under heavy loads. Its versatility makes it ideal for most general medium heavy-duty industrial applications. Ideal for platform trucks, wire shelving, warehouse trucks, and carts. Tread width of wheel is 2". Top plate dimension is 4" x 4-1/2". Bolt hole spacing is 2-7/8" x 3-3/8".