Whether at home, on the job, or hitting the range, this right hand Twin Mag outside-the-waistband (OWB) holster provides all-day comfort, as well as security for your double stack magazines. The Twin Mag is constructed of injection molded nylon shell and rust-resistant black oxide fasteners. An adjustable compression screw grants an extremely wide range of fit for double stack magazines, while the Frame-Lock technology grants positive retention during even the most rugged use. It fits double stack magazines for most Glock handguns, such as 9mm models (G17, G19, G26, and G34), .40 caliber models (G22, G23, G27, and G35), .45 GAP models (G37, G38, and G39); and .357 SIG models (G31, G32, and G33).