TufForce 30mm Dia. Side Offset Ring for Flashlight/ Dot sight, RG-FL2530DS 30mm Diameter tube Offset Ring, 40 degree off side with see-thru Do Not Block the Front Site with off side see-thru 30mm length Weaver/Picatinny Base4- M4 screws and a wrench included Fit for Dot sight / flashlight Lightweight and Extra-Durable 6061 Aircraft Aluminum