'Caster Wheel, Load Rating 2000 lb., Wheel Dia. 6 In., System of Measurement Inch, Wheel Width 3 In., Wheel/Tread Material Polyurethane, Wheel Color Yellow, Wheel Core Material Cast Iron, Hub Length 3-1/2 In., Fits Axle Dia. 3/4 In., includes Spanner Bushing Included, Core Color Silver, Ball Caster Wheel Bearings, Durometer 92 Shore A, Resistant To Chemicals, Acids, Oil, Features Floor Protective, Noise Reduction, Bore Dia. 3/4 In., Replacement For Blickle Series, Includes (2) Top Hat Bushings'