Uncle Mike's Quick Detachable Magnum Band Sling Swivels Magnum-split barrel band base mounts easily without tools or dismantling the for end These sets fit most 12 gauge Shotguns Swivels work with 1 inches slings Magnum split barrel band base mounts without tools or dismantling Fits most single barrel 12-gauge shotguns .850" - .900" diameter Wood screw base for buttstock.Single and Over/Unders,Blued, 1-Inch Loop Closed Link technology creates a permanent ring bond