Hammers One Piece Magnum Air Rifle Scope Mount AM222M Medium Height Great for use on air rifles, rim fire rifles with 3/8inch dovetail scope base Fits all scopes with standard 1inch main tube One piece body with wrap around ring design gives exceptional clamping consistency and centering alignment Smooth and curved contour is more attractive and less chance of tangling when in use Mounts onto 3/8inch dovetail rails or grooved receivers 27.50mm center height good for mounting scope with adjustable objective size up to 42mm Removable threaded stop pin is built in and can be activated easily when needed 4 Mounting screws give lots of clamping power and make the mounted scope firm and stay in place under recoil in every shooting situation Ring saddle height: 14.80mm Overall Length: 100mm (4inch) Opening between two rings: 60mm (2.3inch) Works with typical full-size air rifle scopes around 12inch or longer Weight: 4.2oz.