"The Fairbanks Swivel Weldless Caster features one-piece construction to eliminate stress buildup. Double ball raceways and seal ring keep lubrication in and dirt out. U.S.A. Mount Height in. 9 1/2, Overall Height in. 9 1/2, Foot Brake No, Bolt Hole Spacing 3-3 5/8 x 2 5/8-3, Wheel Width in. 2, Bearing Type Roller, Top Plate Dimensions L x W in. 4 1/2 x 4, Capacity lbs. 1,200, Casters qty. 1, Wheel Type Phenolic canvas, Wheel Diameter in. 8, Material Type Steel, Caster Type Swivel, Finish Type Gray. One piece fork assures less failure and longer life 3/4in. king pin is orbital cold forged for superior strength and stability Nylon grease seal keeps dirt and debris out of the upper ball raceway Gray powder-coat finish prevents corrosion Rugged phenolic/canvas wheel 1200 lbs. capacity"