"The Fairbanks Rigid 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. Material Type Steel, Finish Type Gray, Wheel Diameter in. 6, Wheel Width in. 2, Capacity lbs. 1,100, Casters qty. 1, Top Plate Dimensions L x W in. 4 1/2 x 4, Bolt Hole Spacing 3-3 5/8 x 2 5/8-3, Wheel Type Polyurethane/semi-steel core, Mount Height in. 7 1/4, Overall Height in. 7 1/4, Bearing Type Roller, Foot Brake No, Caster Type Rigid. 3/4in. king pin One piece fork assures less failure and longer life Durable powder-coat finish Rugged polyurethane on cast iron wheel 1,100 lb. capacity"