Fits all scopes with a one inch body tube Mounts onto 3/8inch dovetail rails or grooved receivers 35mm center height good for mount scope with adjustable objective size up to 50mm Removable threaded stop pin is built in and can be activated easily 4 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 3.93inch Opening between two rings: 2.28inch Works with typical full-size air rifle scopes around 12inch or longer