Sportsmatch SPM AOP55 1-Pc Adjustable Mount w/1" Rings, High, 9.5-11mm Dovetail 1" rings High profile Fits 9.5-11.5mm dovetail 4 hex screws/ring to secure scope Adjustable for windage & elevation Ideal for guns that need additional scope elevation The hex screws on the base let you adjust the base to fit the different width rails found on airguns. The clamp is made to securely fit a range of dovetail widths. Helpful resources: Tips for picking scope mounts