Because it's a pole that has to hold 80 pounds at a time, these things can't deliver. They're light and probably can't support 80 pounds, and both waves flexed like a pretzel when the load hit them. They have been replaced with truck racks and they are heavy duty. Shafts of racks have a larger diameter, which allows them to withstand the load. Don't waste money on them. I wish I could give these zero stars.