V-Groove Track Wheel 880 lb Load Rating 300 to 999 lb 3 7/8 in Wheel Dia 1 5/8 in Wheel Width Nylon Wheel/Tread Material Hard Wheel/Tread Hardness Rating 80 Shore D Wheel/Tread Hardness Precision Ball Wheel Bearing Type V-Groove Tread Shape For Axle Size 9/16 in 13/16 in Groove Width Not Included Includes Spanner Bushing Nylon Wheel Core Material Yes Non-Marking 1 5/8 in Hub Length