The Grafmatic film holder is the thicker that a conventional 2 sheet film holder. It has a "D" ring, a locking device, and a small release tab. The holder is actually a light tight box with an internal tray that holds 6 "septums". Each septum is a thin light weight metal holder for a single piece of sheet film. These are stacked one on top of another inside the tray that is then inserted inside the outter light tight box. When used, the holder shuffels the 6 septums sequentially from the stack to the film plane and then back to the stack.