RWM Casters 47 Series Plate Caster, Swivel with Installable Face Contact Brake, Kingpinless, Urethane on Iron Wheel, Roller Bearing, 1230 lbs Capacity, 6" Wheel Dia, 2" Wheel Width, 7-1/2" Mount Height, 4-1/2" Plate Length, 4" Plate Width