Power mags are lean and sleek, yet they are extra-heavy-duty with increased reliability and service life.A unique all-steel follower design yields the lowest possible bearing surface for long-lasting function in dirty environments when ongoing cleaning and maintenance may not be possible.The unique follower design also functions as a spring, which allows the high tensile rocket wire spring coils to be the largest (side to side, front to back, and top to bottom) of any extra capacity.45 caliber 1911 magazine.Caliber: 45 ACPCapacity: 8rdFinish: FluoropolymerModel: Power MagMaterial: Stainless SteelType: DetachableModel Fit: 1911 OfficerCapacity: 8