Sportsmatch 34mm Scope Mount Rings, Dovetail, 2-Piece 34mm" rings High profile Fits 9.5-11.5mm dovetail Up to 60mm lens diameter Adjustable for Elevation and Height 24mm - 25.3mm - (Height from where the ring base touches rail to bottom of scope ring) 4 hex screws/ring secure the scope EASYFIT arrestor pin scope stop (removable) The 2 hex screws on the base let you adjust the rings to fit the different width rails found on airguns. The clamp is made to securely fit a range of dovetail widths.