Maglula's 1911a1 aligning insert is an add-on for the uplula and 22uplula loaders.It assist loading single-stack magazines by eliminating wiggling of the mag inside the loader.It connects to and is used with an existing loader.The 1911ai inserts is packed two in a blister and is useful with mags of width less than 14.5mm (0.57").Caliber: Multi-CaliberFinish: GrayModel: 1911A1Material: PolymerType: Aligner InsertModel Fit: 1911