Kingpinless Caster Load Rating 815 lb. Wheel Dia 6 In. Wheel Width 1-3/4 In. Overall Height 8 In. Wheel Material Rubber Inside Bolt Hole Spacing 2-7/16 x 4-15/16 In. Outside Bolt Hole Spacing 3-3/8 x 5-1/4 In. Plate Type A Wheel Color Black Core Material Cast Iron Raceway Single Ball Hardened Wheel Bearings Roller Replacement Wheel Mfr No 150 RU15 Plate Size 5-1/4 x 6-9/16 In. Includes Top Grease Seal Durometer 85 Shore A Core Color Black Mounting Bolt Dia 1/2 In.