Tarrison Threaded Swivel Caster is a polyurethane non-marking stem caster that fits easily and securely intoTorngat Shelving Wire Shelf Posts with Adjustable Foot.Adding mobility to stationary units, simply remove the foot and screw in the caster. Swivel feature and a 5\” wheel makes moving shelving units easier throughout your operation.Load rating is 300 lb per caster.