Advanced Technology Fluted Mag Ext Swivel Stud Cap Easy Installation Constructed of Military Type III Anodized, 6061 T6 Aluminum Virtually Indestructible Fits ATI Aluminum Fluted Mag Extensions for most 12 Ga Winchester 1200/1300 Shotguns, 12 Ga Remington 870 Shotguns and CZ 712 12 Ga Shotguns Manufactured in the USA