"This Fairbanks Thermoplastic Rubber Swivel Caster is a versatile and durable solution for a variety of applications. Stem dimensions 1/2in. dia. x 1in.L, 13 threads per inch. Capacity lbs. 300, Bearing Type Ball, Wheel Type Thermoplastic rubber, Post in. 1/2-13 x 1, Wheel Width in. 1.25, Caster Type Swivel, Overall Height in. 6 1/16, Finish Type Zinc-plated, Casters qty. 1, Wheel Diameter in. 5. Cold-formed fork and threaded stem Kingpin construction Electro-galvanized zinc finish resists rust Thermoplastic rubber wheel"