The S25D holds 25 shotshells in the down position. The removable tray is for 20 gauge. With the tray out, the box it will hold up to three-inch 12 and 16 gauge shells. The two .75-inch 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, and 12 gauge Choke Tubes with a maximum length of 2.7 inches.