upgrade your Ruger with this tactical picatinny / weaver scope rail mount base. Easy to fit yourself with mounting screws and 1/4 hex shank torx tool for the screws. Fits Ruger 10/22, takedown, 96/22 11 slots. 120mm long. 21mm wide. 4 mounting screws. Torx tool. flat centre line so the open sights can be used. 1) Black 2) Silver