The S25D holds 25 shot shells in the down position. The removable tray is for 20 gauge and can be discarded. With the tray out, the box it will hold up to 3" 12 and 16 gauge shells. 2 3/4" fired shells fit back in the box, important, if you`re reloading. The latch has been designed to be opened easily, even with gloves. Can also be used to organize some brands of 28, 20, and12 gauge Choke Tubes with a maximum length of 2. 7".