Midwest Industries Inc MIQD34Sm Quick Detach 1-Piece Base & Ring Combo 34mm Black Finish This Scope Mount From Midwest Industries makes Taking Your Scope Off Your Firearm a Breeze. It features a Quick Detach Lever So There Is No Need To Carry Multiple tools. It Is Made Of 6061 Aluminum To Ensure a Long Life Of Reliability And Dependability. This Model Fits a 34mm Tube Diameter.