The Midwest Industries allows the use of multiple Midwest Industries Universal Shell Holders. You can purchase the Shell Holder Plate, or the bundle to get the Shell Holder Plate with 6-Shell Holders to get up to 12 extra rounds of ammunition! Gives the user the ability to use up to 6 Universal Shell Holders Up to 12 extra rounds of ammunition for a firearm Lightweight skeletonized design Made of Hard Coat Anodized 6061 Aluminum Made in the USA *Not compatible with other manufacturer's products* Mfg: Midwest Industries