Kingpinless Caster Load Rating 1000 lb. Wheel Dia 6 In. Wheel Width 2 In. Overall Height 7-1/2 In. Wheel Material Polyurethane Inside Bolt Hole Spacing 3 x 3 In. Outside Bolt Hole Spacing 2-5/8 x 3-5/8 In. Plate Type B Wheel Color Green Core Material Polyurethane Raceway Single Ball Wheel Bearings Stainless Roller Plate Size 4 x 4-1/2 In. Durometer 75 Shore D Core Color Green Mounting Bolt Dia 3/8 In. Frame Material Stainless Steel Plate Thickness 0.30 In.