Twin-Wheel Threaded Stem Caster, Swivel Caster with Total Lock, 220 lb Load Rating, 0 to 299 lb, 4 15/16 in Wheel Dia., 3 1/4 in Wheel Width, Polyurethane Wheel/Tread Material, 6 1/16 in Mounting Height, Precision Ball, M12-25 x 25/32 in Caster Stem Size, Threaded, Nylon Caster Frame Material, No Finish Frame Finish, Yes Non-Marking, 2 Number of Wheels