V-Groove Track Wheel 300 lb Load Rating 300 to 999 lb 4 in Wheel Dia 2 in Wheel Width Polyurethane Wheel/Tread Material Hard Wheel/Tread Hardness Rating 60 Shore D Wheel/Tread Hardness Roller Wheel Bearing Type V-Groove Tread Shape For Axle Size 1/2 in Included Includes Spanner Bushing Polyurethane Wheel Core Material Yes Non-Marking 2 7/16 in Hub Length