E.R. Wagner Americaster Plate Caster, Swivel with Strap Brake, Dust Cover, Polyurethane on Polyolefin Wheel, Delrin Bearing, 275 lbs Capacity, 4" Wheel Dia, 1-1/4" Wheel Width, 5-1/8" Mount Height, 3-3/4" Plate Length, 2-3/4" Plate Width