The Warne Skyline Precision 34mm Diving Board replaces the front ring cap on any 34mm Skyline Mount and features an extended and raised Picatinny rail section that is designed for use with weapon mounted ballistic rangefinders, red dot optics or any other picatinny mounted accessories that need scope turret clearance. The integral cantilevered rail design not only provides a rock-solid mounting platform that will hold zero in any conditions but can also be used as a stabilizing point for shooters who place their off hand on top of the scope for balance. Perfect for use in PRS, NRL, Precision Rifle Series.