Ok I built about stepmber as rat rack with those plastic bins from lowes/home depot. well even with fresh food and chew items all but one tub been chewed up. I tried everything and am so irked at the fact they chewed up the tubs it not funny. I am gonigo t ask my uncle ( who a welder ) if get him the measurements if he can make me 6 metal based ones for use in the rack. ( might need ot make some small adjustments to the rack but It be long lasting and better for me in the long run asi can sand and paint these ( or coat them with bed liner paint) and they can chew all the want on 1/4 inch metal lol . it alwasy with the newest group I get from a store or from someone ..