These Gladiator Garageworks heavy duty shelves are VERY heavy duty. The box they arrived in was labeled at 128 pounds! These are tough, well-made, heavy duty shelves. They are certainly sturdy, and ideal for large, heavy items in my garage. The only slight downfall with these shelves was the little bit of difficulty assembling them because of their weight. It was just a little tough maneuvering them during assembly. However, that just means that they will remain ideal shelves, perfect for my garage, as they are much more durable and stronger than other shelving units I have used before.