Marathon Two Tire Wheelbarrow Conversion Kit Convert your single tire wheelbarrow into a dual wheel Dual Wheels make it easier to lift and maneuver your wheelbarrow Designed to fit 99-percent of all wheelbarrows Tires offer up to a 600-pound capacity that may be limited by wheelbarrow capacity Kit includes 2 universal fit 4-ply ribbed pneumatic tires on 8-inch steel rims, 5/8inch steel axle 20" long,4 spacers,2 washers,2 cotter pins and 2 attachment brackets