One Piece Dovetail Scope Mount with Stop Pin for High Power Magnum Airguns Fits all scopes with a one-inch body tube. Mounts onto 3/8inch 11mm dovetail rails or grooved receivers. 33mm center height, good for mounting a scope with adjustable objective size up to 50mm. Removable threaded stop pin is built in and can be activated easily. 5 Mounting screws give lots of clamping power and make the mounted scope firm and stay in place under recoil in every shooting situation. Full length of the mount is 4 3/4inch. Opening between two rings: 3 inches. Works with typical full-size air rifle scopes around 12 inches or longer.