Polyolefin Tread Wheel 450 lb Load Rating 300 to 999 lb Load Rating Range 5 in Wheel Dia 1 3/8 in Wheel Width Polyolefin Wheel/Tread Material Hard 75 Shore D Delrin Standard Tread Shape 3/8 in For Axle Size Not Included Includes Spanner Bushing Plastic Wheel Core Material Yes Non-Marking 1 1/2 in Hub Length