The Blackhawk Double Mag Case features a built-in tension spring that securely holds two single stack magazines of various sizes. It features an adjustable belt-clip hook that accommodates belts of different widths. Features: Features a built-in tension spring to securely hold magazines of various sizes Includes belt loops and adjustable belt clip Curved to waistline for slimmer profile Fits 9mm/.40 cal/.45 cal/10mm/.357 Sig