V-Groove Track Wheel 600 lb Load Rating 300 to 999 lb 4 in Wheel Dia 1 1/2 in Wheel Width Steel Wheel/Tread Material Extra Hard Wheel/Tread Hardness Rating 188 BHN Wheel/Tread Hardness Roller Wheel Bearing Type V-Groove Tread Shape For Axle Size 3/4 in 7/8 in Groove Width Not Included Includes Spanner Bushing Steel Wheel Core Material Yes Non-Marking 1 3/4 in Hub Length