Even if you carry a modern high-capacity semi-automatic pistol, it's important to carry a reload. Not only is it impossible to predict how many rounds a gunfight will last, but magazines can sometimes fail and it's important to have a backup handy.Specifications and Features: Built-in tension spring securely holds magazines of various sizes Available in both single-stack and staggered column magazine versions Includes belt loops and belt clip Adjustable belt-clip hook for belts of different widths Curved to waistline for slimmer profile Fits 9mm and .40-caliber magazines