This is more sturdy than I thought it would be. The assembly instructions are lacking, but it's pretty straightforward to tap everything together. Comes with a baby mallet to assemble, but you can save yourself some effort with a proper mallet. Once you have everything in place, go over tapping all the spots again, and it will increase rigidity. I have about 250 pounds per shelf, and it is fine. I did create a wire tie to use at the top for tip over prevention. All and all, I'd say this is a great garage shelf, or light industrial shelf, but not quite up to the heavy duty commercial standards.