NSF-Listed Sanitary Plate Caster Swivel Caster 150 lb Load Rating 0 to 299 lb 4 in Wheel Dia 1 in Wheel Width Polyolefin Wheel/Tread Material 4 3/4 in Mounting Height Plain 7/16 in x 1 3/8 in Caster Stem Size Friction Ring Steel Caster Frame Material Zinc Frame Finish Yes Non-Marking 1 in Number of Wheels