Ruger 10/22:
Mount fits both left and right hand firearms.
Base screws areย 6-48 X 1/4โณ long. Ring screws are 6-40 X 5/8โณ long. Both screwsย use a 7/64โณ Allen wrench.
Outside to outside of rings is 4.29โณ. Standard rings are .63โณ wide and have 2 ring screws per ring. ย 4 Hole to hole spacing dimensions are .86โณ, 2.57โณ, .50โณ. Height of mounts from top of receiver to centerline of scope tube is โย low .94โณ, medium 1.06โณ, and high 1.19โณ.