moth repellant holder for Ikea closets

In some countries (but not in Norway, not that I've seen yet) you can buy a moth repellant in the form of a felt (paper?) pad soaked with some kind of chemical. My wife wanted to put some of those in the closet where she keeps her wool stuff. So I made this little holder which fits into the shelf mounting holes inside. The holes are probably 1/4 inch or so, the same as you'd have in any cabinet which can accept plastic shelf brackets.