UTG 30mm/2PCs High Profile Airgun Rings w/Stop Pin BEWARE COUNTERFEIT PRODUCTS NOT SOLD BY Amazon.com 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 Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish.