UTG 30mm/2PCs High Pro Airgun QD Rings w/Stop Pin:22mm Wide 4-screw High Profile "Tiger" Ring Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish User Friendly Quick Detach/Lock Lever with Full Adjustability to Fit on any 9-11mm Rail Innovative, Robust, Spring Loaded Stop-pin for Tough Recoil Resistance, Compatible with Rails with or without Recess Hole Spring Tension Controlled Locking Plate with Steel Insert to Guarantee Most Secured Installation