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. U shape down centre line so the open sights can be used. 1) Black 2) Silver + order the 10/22 deluxe buffer with this and buffer is only $8. * video clip shows how quick and easy it is to install (not same brand)