Alstar Schmidt-Cassegrain Finder Scope Base - Attach Standard Finder Scope,Laser Pointer Bracket or Reflex Sight Bracket - The clamp in The Bottom of Dovetail Base fits Standard Vixen Dovetail bar

Fits factory drilled holes on Cele stron; Mea de; and Or ion Schmidt Cassegrain telescopes; attaches directly to Schmidt Cassegrain Telescope / SCT optical tube with included mounting hardware, Allows you to attach any standard finder scope; Laser Pointer bracket or reflex sight bracket to Schmidt Cassegrain telescopes up to 11 inch aperture; great for second or third aiming device to your Schmidt Cassegrain for multiple aiming options, Made of high strength Aluminum with Anodizing Aluminium Process; The base is made of die cast metal and features one large thumbscrew locks; Includes two M4 screws, Synta style dovetail base: Fit most bracket designs from Cele stron; Or ion; Sky watcher; Vi xen; Compliable with finder scope; Laser Pointer bracket on telescopes; The clamp in the bottom of dovetail base is fit standard Vixen dovetail bar, Drilled but not threaded to accommodate screws up to 4 mm in diameter; Center to center screw hole spacing on your telescope must be from 21 to 37.3 mm in order for this dovetail base to be compatible