V-Groove Track Wheel, 15,000 lb Load Rating, 6000 lb and Greater, 8 in Wheel Dia., 4 in Wheel Width, Steel Wheel/Tread Material, Extra Hard Wheel/Tread Hardness Rating, 179 BHN Wheel/Tread Hardness, Precision Ball Wheel Bearing Type, V-Groove Tread Shape, For Axle Size 1 1/4 in, 1 3/4 in Groove Width, Not Included Includes Spanner Bushing, Steel Wheel Core Material, Yes Non-Marking, 4 1/4 in Hub Length