Kingpinless Caster Load Rating 5500 lb. Wheel Dia 10 In. Wheel Width 3 In. Overall Height 11-15/16 In. Wheel Material Polyurethane Inside Bolt Hole Spacing 4 x 7-3/4 In. Outside Bolt Hole Spacing 4 x 7-3/4 In. Plate Type D Wheel Color Tan Core Material Cast Iron Raceway Single Ball Hardened Wheel Bearings Precision Tapered Roller Replacement Wheel Mfr No 250 PTTT Plate Size 7-3/4 x 9-3/8 In. Durometer 95 Shore A Core Color Gray Mounting Bolt Dia 5/8 In. Frame Material Steel