"The Fairbanks Swivel Zinc-Plated Caster features all-steel exclusive Lockweld construction. Zinc galvanized finish. Swivel casters are single ball race. Polyolefin wheels. U.S.A. Wheel Width in. 1 1/4, Mount Height in. 3 3/4, Wheel Diameter in. 3, Overall Height in. 3 3/4, Top Plate Dimensions L x W in. 4 1/8 x 3 1/8, Bolt Hole Spacing 3 7/16 x 2 3/8, Finish Type Zinc plated, Wheel Type Polyolefin, Foot Brake No, Material Type Steel, Bearing Type Plain, Caster Type Swivel, Casters qty. 1, Capacity lbs. 250. Cold-formed for greater strength and durabilty Zinc electro-galvanized finish assure a bright look and rust prevention Unique construction replaces the king pin with a strong welded structure Rugged polyolefin wheel"