This specialized dovetail mounting base fits factory drilled holes on most Meade, Celestron, and Orion Schmidt-Cassegrain telescopes, allowing you to add a high-quality Alstar aiming device for enhanced performance under the stars. Aluminum dovetail base is designed to accept finder scope (with bracket) or EZ Finder. Ideal for custom installation of a finder scope on telescopes not already equipped with a compatible base. Bases feature two large thumbscrew locks to secure the finder scope bracket in place. Includes mounting hardware. There are two attachment screws to hold it to your optical tube assembly. Just put it on the optical tube and tighten the screws. Oval-shaped mounting holes make this dovetail base compatible with a wide variety of SCT telescopes. The dovetail base accepts the bracket of all Alstar finder scopes and EZ Finder reflex sights. Two large knurled thumbscrews makes it easy to install and detach your finder scope or reflex sight, even while wearing gloves. .