Dovetail to Picatinny/Weaver Cantilever Rail Adaptor. 5.7" Picatinny Top Rail with 14 Slots to Provide Flexible Eye Relief Adjustment and Mounting Flexibility of Various Optics. Fits 9mm - 11mm Airgun/Shotgun Dovetail Rails. Comes with 4 High Strength Screws and Adjustable Recoil Resistant Stop Pins Which Ensures Solid Locking and Zero Holding and is Designed to Resist Bidirectional Recoil Force. Easily Slides On and Universally Fits Both Flat & Rounded Dovetail Receivers. Precision Machined from Aircraft Aluminum and Finished with a Matte Black Hard Coat Anodize. Saddle Height is 0.59"