Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish. * Complete with Stop-Pin for Rock Solid Application. * Ring Base Designed with Locking Hex Screws to Tightly Fit on Mounts with Airgun/.22 Dovetail Dimensions. * Reversible Locking Plate to Fit Full Range of Airgun/.22 Rails * Great Quality at Most Affordable Price.