"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. Finish Type Gray, Capacity lbs. 600, Top Plate Dimensions L x W in. 4 1/2 x 4, Wheel Type Phenolic canvas, Foot Brake No, Bolt Hole Spacing 3 3/4 x 2 5/8 to 3, Caster Type Rigid, Bearing Type Roller, Wheel Width in. 2, Mount Height in. 5 5/8, Overall Height in. 5 5/8, Wheel Diameter in. 4, Material Type Steel, Casters qty. 1. One-piece fork assures less failure and longer life Gray powder-coat finish prevents corrosion Sturdy phenolic/canvas wheel 600-lb. capacity"