Iron Tread Wheel 650 lb Load Rating 300 to 999 lb Load Rating Range 4 in Wheel Dia 1 1/2 in Wheel Width Iron Wheel/Tread Material Extra Hard Roller Standard Tread Shape 3/8 in 1/2 in For Axle Size Included Includes Spanner Bushing Plastic Wheel Core Material Yes Non-Marking 1 5/8 in Hub Length