V-Groove Track Wheel, 800 lb Load Rating, 300 to 999 lb, 4 in Wheel Dia., 2 in Wheel Width, Iron Wheel/Tread Material, Extra Hard Wheel/Tread Hardness Rating, 180-220 BHN Wheel/Tread Hardness, Roller Wheel Bearing Type, V-Groove Tread Shape, For Axle Size 3/4 in, Not Included Includes Spanner Bushing, Plastic Wheel Core Material, Yes Non-Marking, 2 3/16 in Hub Length