Attatchment Clip for Elfa Shelves

This is a part compatible with the Container Store's Elfa shelving. I'm only posting the clip. I don't want to take away from their business but if you also did something like buy one of their utility boards http://www.containerstore.com/shop/elfa/components/elfautility?productId=10034897&N=77780 specifically because you knew you would be making your own parts for it, well I just saved you some time.