Rubber Tread on Aluminum Core Wheel, 550 lb Load Rating, 300 to 999 lb Load Rating Range, 4 15/16 in Wheel Dia., 1 5/8 in Wheel Width, Rubber Wheel/Tread Material, Soft, 65 Shore A, Precision Ball, Standard Tread Shape, 1/2 in For Axle Size, Not Included Includes Spanner Bushing, Aluminum Wheel Core Material, No Non-Marking, 2 3/8 in Hub Length