Built-in tension springs secure your magazines without snaps or flaps and give you fast access for quick reloads. Curved for a snug, low-profile fit at your waist. Includes belt loops and a belt clip with adjustable hooks for fitting belts of various sizes. Fits 9mm and .40-caliber magazines. Single stack magazines have ammunition stacked one on top of another. Double stack magazines offset the ammunition within the magazine. Please check your firearm magazine to ensure proper style is ordered. Available: Double Stack, Single Stack. Finishes: Matte Black, Carbon Fiber.