"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. Top Plate Dimensions L x W in. 4 1/2 x 4, Finish Type Gray, Caster Type Rigid, Capacity lbs. 1,200, Foot Brake No, Wheel Width in. 2, Material Type Steel, Bolt Hole Spacing 3-3 5/8 x 2 5/8-3, Overall Height in. 9 1/2, Bearing Type Roller, Casters qty. 1, Mount Height in. 9 1/2, Wheel Type Phenolic canvas, Wheel Diameter in. 8. 3/4in. king pin One piece fork assures less failure and longer life Durable powder-coat finish Rugged phenolic/canvas wheel 1200 lbs. capacity"