Swivel Plate Caster, 6" Load Height. Plate Mount Caster, W/Brake [5" Dia] X [1-1/4" Wide], Grey Polyurethane (3/8" Axle), (3/8" Bore), (1-5/8" Hub Width), Tread Type-Flat, Ball Bearing, Capacity 300 Lbs. (Plate Size 2-3/8" X 3-5/8") And (1-3/4" X 3" Hole Centers), (Load Height-6")(Wheel # 28-1313