Twin-Wheel Threaded Stem Caster, Swivel Caster with Total Lock, 275 lb Load Rating, 0 to 299 lb, 4 in Wheel Dia., 2 1/2 in Wheel Width, Polyurethane Wheel/Tread Material, 4 11/16 in Mounting Height, Precision Ball, 3/16 in x 15/32 in Caster Stem Size,...