Detail Information: 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 High Material: Aluminum Pieces: 1 Rail Type: .22/Airgun Profile Level: High Ring Diameter: 1 Inch Ring Width: 21 mm Max. Scope Outer Dia.: 67 mm Screws Per Ring: 4 A: 1 Inch B: 21mm C: 21mm D: 100mm E: 100mm Medium Material: Aluminum Pieces: 1 Rail Type: .22/Airgun Profile Level: Medium Ring Diameter: 1 Inch Ring Width: 21 mm Max. Scope Outer Dia.: 53 mm Screws Per Ring: 4 A: 1 Inch B: 21mm C: 14mm D: 100mm E: 100mm