Fits 9mm, 40cal, 45acp Double Stack Magazines.
Glock19 magazines are the shortest you want to use in these pouches.
(Will not work for Glock26 or similer magazines they too short in height).
Due to the GAP's in the pouch, it is intended to be used on belts and will not line up with MOLLE/PALS webbing. 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.