WINDFIRE Tactical New 25.4mm 1" / 30mm Ring Scope Mounts Tube Flashlight Clamp 20mm Weaver Barrel Mount Rail Adapter with Inserts for Scope Flashlight Red Dot/Reflex Sights Precision Machined Out of Premium 6061 Aircraft Aluminum 5.4mm 1" to 30mm ring fastens around 30mm and 1" (with inserts) scope tubes, installing via two set screws and included hex key Lets you mount such accessories as red dot sight, laser, or flashlight Two tighten screws design for more secure and stability , comes with one Allen wrench to install Ring Diameterc can fit : 25.4/30mm , Rail style: Picatinny Weaver style