Detail Information: 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 Material: Aluminum Weight: 6 oz Pieces: 2 Rail Type: .22/Airgun Profile Level: High Ring Diameter: 30mm Ring Width: 22 mm Max. Scope Outer Dia.: 74 mm Screws Per Ring: 4 A: 30mm B: 22mm C: 22mm D: N/A E: N/A