UTG 1"/2PCs Med Profile Airgun QD Rings w/Stop Pin:22mm Wide 4-screw Medium Profile "Tiger" Ring Precision Machined from Aircraft-grade Aluminum Alloy with Anodized Black Matte Finish User Friendly Quick Detach Lever Lock with Full Adjustability to Fit on any 9-11mm Rail Innovative Robust Recoil-proof Spring Tensioned Stop-pin for Rails with or without Recess Holes Spring Tension Controlled Locking Plate with Steel Insert Guarantees Most Secure Installation