Phenolic Tread Wheel, 800 lb Load Rating, 300 to 999 lb Load Rating Range, 4 in Wheel Dia., 2 in Wheel Width, Phenolic Wheel/Tread Material, Hard, 90 Shore D, Roller, Standard Tread Shape, 1/2 in For Axle Size, Not Included Includes Spanner Bushing, Iron Wheel Core Material, Yes Non-Marking, 2 7/16 in Hub Length