Double Stack Tuckable IWB Mag Pouch. Fits 9mm, 40 Cal, 45 ACP. Lifetime Replacement Warranty IWB (Inside the Waistband) Tuckable Holster (You can tuck your shirt in.) Ambidextrous (Clip can be moved to RH or LH position.) Please note that magazines for full size pistols can be bulky and uncomfortable.