A friend of mine gave me his rat rack that he built with intentions of using but never got to. It had a tiny tiny gap between hardware cloth and top of the tubs but I did not think anything of it. I just came home from working for 14 hours straight and doing another 2 hours of homework and what do I want into my shed to see? bedding everywhere and 7 rats running around. Let me tell you I cannot begin to explain my excitement in this event! Time to build another now.