"This Fairbanks Polyolefin Swivel Caster is durable, easy-rolling and features rugged kingpin construction. Overall Height in. 6 1/16, Capacity lbs. 300, Bearing Type Plain, Wheel Width in. 1, Wheel Diameter in. 5, Post in. 1/2-13 x 1, Casters qty. 1, Finish Type Zinc-plated, Wheel Type Polyolefin, Caster Type Swivel. Cold-formed for added strength and durability Electro-galvanized zinc finish resists rust Polyolefin wheel"