UTG 30mm/2 Pcs. Medium Profile Airgun Rings w/Stop Pin Features: - 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 Specifications: - Material: Aluminum - Pieces: 2 - Rail Type: .22/Airgun - Profile Level: Medium - Ring Diameter: 30mm - Ring Width: 21 mm - Max. Scope Outer Dia.: 58 mm - Screws Per Ring: 4