Hollow Kingpin Swivel Caster w/Total-Lock Stem Type Hollow Kingpin Wheel Dia 3 In. Wheel Width 1 In. Load Rating 220 lb. Overall Height 3-15/16 In. Wheel Material Thermoplastic Rubber Wheel Color Gray Core Material Polyolefin Core Color Gray Precision Ball Wheel Bearings Stem Dia 1/2 in Bolt Hole Brake Type Total-Lock Raceway Double Ball Hardened Polished Zinc Frame Finish Application Medical Includes Thread Guards