Barska Shotgun Ring Mount. This set of Barska mounts includes one barrel clamp and one mounting ring; attach the barrel clamp to your shotgun or rifle's barrel then mount the ring to the clamp's Picatinny rail. Both rings are made from sturdy aluminum and feature a non-reflective black matte finish. The Barska Shotgun Barrel Clamp and Scope Ring Set includes a Picatinny scope ring with a 1" tube diameter perfect for mounting a wide range of scopes. Barska has designed the scope ring to attach and detach to the barrel clamp easily with a large thumb screw. Attach a scope or other accessories to your shotgun with ease and security using the Barska Shotgun Barrel Ring Mount w/ 1" Scope Ring. Specifications for Barska Aluminum Shotgun Barrel Clamp Ring Mount w/ Ring: Height: 1.45" Barrel Clamp Diameter: 30mm Scope Ring Diameter: 1" Length: 2.38" Material: Aluminum Finish: Black Matte Lock Nuts: 4 Features of Barska Shotgun Picatinny Barrel Clamp and Mounting Ring: Mounting equipment for shotguns by Barska 30mm barrel clamp attaches securely to most shotgun and rifle barrels Comes with a 1" scope ring w/ large thumb screw Picatinny rail type Black matte finish Sturdy aluminum construction Backed by the Barska limited one year warranty Package Contents: Barska Shotgun Ring Mount #Rings / Pkg 1 #Set Screws 1 #Lock Nuts 4 Barska AI11726: Shotgun Ring Mount