V-Groove Track Wheel, 7000 lb Load Rating, 6000 lb and Greater, 6 in Wheel Dia., 3 in Wheel Width, Steel Wheel/Tread Material, Extra Hard Wheel/Tread Hardness Rating, Tapered Roller Wheel Bearing Type, V-Groove Tread Shape, For Axle Size 3/4 in, 1 3/8...