Detail Information: 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 Material: Aluminum Weight: 2.6 oz Pieces: 2 Rail Type: .22/Airgun Profile Level: Medium Ring Diameter: 1 Inch Ring Width: 22 mm Max. Scope Outer Dia.: 55 mm Screws Per Ring: 4 A: 1 Inch B: 22mm C: 15mm D: N/A E: N/A