Stem Caster, Swivel Caster with Brake, 225 lb Load Rating, 0 to 299 lb, 4 in Wheel Dia., 1 1/4 in Wheel Width, Polyolefin Wheel/Tread Material, 5 3/8 in Mounting Height, Ball, 1-1/2 in13 x 1-1/2 in Caster Stem Size, Threaded, Nylon Caster Frame Material, Unfinished Frame Finish, Yes Non-Marking, 1 Number of Wheels