Leupold Mark 4 30mm Scope Rings, High, Matte Finish Machined from aircraft grade aluminum, this mounting system is one of the strongest available 2-Piece design ensures easy access to breech area Designed with long-range shooters in mind, this system will ensure that your scope won't shift under recoil Fits rifle scopes with 30mm main tubes Holds the scope's centerline 1.06 in above the top of the mounting base