"Fairbanks Polyolefin Swivel Caster is constructed of cold-forged steel with steel ball bearings and double ball bearing raceways. Caster Type Swivel, Bolt Hole Spacing 1 3/4 x 2 7/8, Finish Type Zinc plated, Top Plate Dimensions L x W in. 2 3/8 x 3 5/8, Mount Height in. 5, Bearing Type Plain, Overall Height in. 5, Wheel Diameter in. 4, Material Type Steel, Wheel Type Polyolefin, Foot Brake No, Casters qty. 1, Capacity lbs. 255, Wheel Width in. 1 1/4. Double-ball raceway for added strength and swivel ability Rugged 1/2in. kingpin Zinc electro-galvanized finish prevents rust and maintains bright look Rugged polyolefin wheel 255-lb. capacity"