The Esstac Pistol Magazine Pouch fits 9mm, 40cal, 45acp Double Stack Magazines. Glock19 magazines are the shortest magazines you want to use in these pouches. It is recommended to be used with belt loops, as WTF straps are not designed to be used with non-standard "mini" pals webbing found on belts.Note- Will not work for Glock26 or similar magazines they too short in height.FeaturesFits 9mm, 40cal, 45acp Double Stack MagazinesGlock19 magazines are the shortest magazines you want to use in these pouchesRecommended to be used with belt loopsWill not work for Glock26 or similar magazines they too short in height