I used zip ties to connect dog chain to each area so I could lock it with a pad lock to keep my kids from pulling the drawers open and letting the snakes out. I have the animal plastic economy rack and I didn't have to actually damage the rack at all to do it. However I did also drill holes in my DIY rack to do the same thing to.

Here are pictures of it. I like that I can unlock one tub at a time without space for a rod.





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