"The Fairbanks Swivel Weldless Caster features one-piece construction to eliminate stress build-up. Double ball raceways and seal ring keep lubrication in and dirt out. U.S.A. Wheel Width in. 2, Overall Height in. 6 1/2, Top Plate Dimensions L x W in. 4 1/2 x 4, Caster Type Swivel, Capacity lbs. 900, Bearing Type No, Mount Height in. 6 1/2, Wheel Type Polyurethane/semi-steel core, Material Type Steel, Bolt Hole Spacing 3-3 5/8, Casters qty. 1, Foot Brake No, Wheel Diameter in. 5. 3/4in. king pin"