This is my very first pen display box. It is also my first time using my Porter Cable 2016 Super Jig to make miniature dovetails... or even dovetails of any kind. It was also my first time using a set of rail and stile bits. The inside was an open tray that a fella from a local wood turner club donated to for my "Police Matter More" project. This box will hold 24 slimline pens. It will hold designers as well but just barely and only if you turn the clips to the side (or remove clips from the pens). An oversight on my part as I was more focused on how to get the dovetails and rail and stiles correct and fitting the tray into the box. OOPS! ;)