Its a great shelf, its basically an insert that you put inside yourself so you have to measure it, although I believe if it was too large it would be very easy to cut down. Ours was just slightly small for our shelf, however that was fine because I have extremely large selves, and it left space for other spices like all day and grilling spices that dont come in around container. I love it.  I love that I can get my spices without everything falling out of a shelf. My friend who is a chef thinks its beautiful as well.