DNZ Products 30mm Tactical Ring w/Level Added 4 Screws Black. 30MM Tactical ring with Level added-Black-4 screws per ring Specifications for DNZ Products 30mm Tactical Ring w/Level Added 4 Screws: Manufacturer: DNZ Products Finish: Matte Base/Mount Type: Riflescope Ring Tube Diameter: 30 mm Fabric/Material: 6061-T6 Aluminum Condition: New Color: Black Features of DNZ Products 30mm Tactical Ring w/Level Added 4 Screws Precision machined from a solid block of top-grade billet aluminum Custom made to fit each type of firearm and align perfectly with your rifles receiver No moving parts between the firearm and the scope 67percent lighter than comparable one-piece mounts with four times the threads and precision socket-head cap screws for absolute strength and security Absorbs shock and withstands temperature extremes better than steel mounts at a fraction of the weight made in specialized factories Package Contents: DNZ Products 30mm Tactical Ring w/Level Added 4 Screws DNZ Products 30TRL: 30mm Tactical Ring w/Level Added 4 Screws Black