Polyolefin Tread Wheel 255 lb Load Rating 0 to 299 lb Load Rating Range 4 in Wheel Dia 1 1/4 in Wheel Width Polyolefin Wheel/Tread Material Hard 65 Shore D Plain Standard Tread Shape 5/16 in For Axle Size Not Included Includes Spanner Bushing Aluminum Wheel Core Material Yes Non-Marking 1 1/2 in Hub Length