Plate Caster Kit Load Rating 180 lb. Wheel Dia 4 In. Wheel Width 1-7/8 In. Overall Height 4-7/8 In. Wheel Material Polypropylene Inside Bolt Hole Spacing 1-3/4 x 3 In. Outside Bolt Hole Spacing 1-3/4 x 3 In. Plate Type D Wheel Color Black Core Material Polypropylene Raceway Single Ball Wheel Bearings Plain Bore Plate Size 2-3/4 x 3-23/32 In. Includes (2) Rigid (2) Swivel with Brakes Hardware Durometer 65 Shore D Core Color Black Mounting Bolt Dia 3/8 In.