Rigid Plate Caster Load Rating 5400 lb. Wheel Dia 6 In. Wheel Width 2-1/2 In. Overall Height 8 In. Wheel Material Nylon Inside Bolt Hole Spacing 3-3/8 x 5-1/4 In. Outside Bolt Hole Spacing 4-1/8 x 6-1/8 In. Plate Type A Wheel Color Black Core Material Nylon Wheel Bearings Precision Ball Replacement Wheel Mfr No NX0642812G Plate Size 5 x 7-1/4 In. Durometer 80 Shore D Core Color Black Mounting Bolt Dia 1/2 In. Frame Material Steel Plate Thickness 0.375 In.