Sniper AG-25M4 1" Medium Profile Scope Ring for Dovetail System with 4 Fasten Screw for More Security 6061-T6 Aluminum Alloy, hard-coat anodized Fits any Dovetail rail ranging from 9mm to 15mm, including 3/8 inch 4 fixing screws per ring for secure hold Dovetail rails are commonly found on .22 style rifles For 1 inch diameter scope tube body Reversible side plate allows rings to fit full selection of Dovetail bases (9mm to 15mm wide)