Kingpinless Caster Load Rating 3960 lb. Wheel Dia 8 In. Wheel Width 3 In. Overall Height 10-3/8 In. Wheel Material Polyurethane Inside Bolt Hole Spacing 3-3/8 x 5-1/4 In. Outside Bolt Hole Spacing 4-1/2 x 6-1/8 In. Plate Type A Wheel Color Tan Core Material Cast Iron Raceway Double Ball Hardened Wheel Bearings Roller Replacement Wheel Mfr No 200 PT2P Plate Size 6 x 7-7/16 In. Durometer 95 Shore A Core Color Gray Mounting Bolt Dia 1/2 In. Frame Material Steel