The Arisaka Optic Leveler is an affordable and user-friendly tool designed to precisely level scopes mounted in rings or one-piece mounts. The base plate rests on the Picatinny rail or one-piece mount beneath the scope's turret cluster. By inserting the matching wedge from the side, the 11-degree ramped surfaces of the wedge and base engage, causing the top of the wedge to rise and contact the turret cluster, automatically leveling the scope.This product includes the leveler base and both small and large wedges.The small wedge requires a space between the rail/mount and turret cluster from 0.190" to 0.730".The large wedge requires a space between the rail/mount and turret cluster from 0.680" to 1.200".