Heavy duty, each wheel weighs almost 14 1/2 lbs. 8 inches is diameter and 3 inches wide. Has a steel sleeve in the axle hole. I measure it as for a 1 3/4 inch axle. With the sleeve removed the axle hole is 1 15/16 inches, measurements as close as I could determine. Probably had roller bearings at one time, but I do not have. They could be made of  rod and allow a smaller axle to be used. Shipped cheapest way, depending on distance. Lot PP