Rigel Systems QuickFinder Extra Base The Rigel Quikfinder comes with two plastic bases (one for large and one for small telescopes). However, you can purchase additional bases for use on multiple telescopes. Leave the bases attached to the telescope tube, and simply unclip the Quikfinder from its base on one scope and move it to another telescope if you need to. Easy clip-on / clip-off means that there are no screws to fumble with. This large base can be used on tubes larger than about 6" in diameter. In the Box Rigel Systems QuickFinder Extra Base, at selected size : Small (tube diameter < 6 inches) Large (tube diameter >= 6 inches) Manual & Warrany Rigel Systems - 1 Year Limited QuickFinder instructions AA Battery Holder Instructions