"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. 2 5/8in. to 3in. x 3in. to 3 5/8in. bolt hole spacing. 3/4in. king pin. Top plate size 4in. x 4 1/2in. U.S.A. Bolt Hole Spacing 3-3 5/8 x 2 5/8-3, Mount Height in. 9 1/2, Finish Type Gray, Top Plate Dimensions L x W in. 4 1/2 x 4, Capacity lbs. 1,200, Foot Brake No, Overall Height in. 9 1/2, Material Type Steel, Wheel Width in. 2, Bearing Type Roller, Wheel Type Polyurethane/semi-steel core, Wheel Diameter in. 8, Caster Type Rigid, Casters qty. 1. One piece fork assures less failure and longer life Durable powder-coat finish Rugged polyurethane on cast iron wheel 1200 lb. capacity"