From the ManufacturerDovetail base fits any finder scope or reflex sight bracket so you can securely attach an aiming device to any telescope. Ideal for custom installation of any finder scope, EZ Finder reflex sight, and Green Laser Pointer bracket on any non- telescope. Also useful for adding a second or third aiming device to your telescope. Aluminum base fits any diameter telescope tube, includes attachment hardware. Not intended for use on Schmidt-Cassegrain telescope optical tubes