With twice the capacity of our Single Mag Cases, the Double Mag Cases have a built-in tension spring that securely holds magazines of various sizes. An adjustable belt-clip hook accommodates belts of different widths. Product Features Built-in tension spring securely holds magazines of various sizes Includes belt loops and belt clip Curved to waistline for slimmer profile Fits 9mm/.40 cal/.45 cal/10 mm/.357 Sig