SV116 Guiding Scope Rings Kit Two fully metal 70mm guide scope rings are suitable for small and medium sized guiding telescopes; ideal for astrophotography for mounting a guide scope parallel to the main telescope. Smooth Surface: all machined surfaces are smooth and flawlessly coated. Adjustment Screws: The adjustment screws are large and easy to grasp and turn. The soft tips of the adjustment screws securely hold the guide scope without marring its surface. The guide scope is held securely enough that accidental bumps wont necessarily throw off the pointing SVBONY universal dovetail base for optical astronomical telescope finder scope Dovetail slots can be installed for Celestron C8, C8HD, C925, C11HD; SKYRVER 80ED, 102ED, 130APO; SKYRVER 100ED binoculars; and other primary mirror, also Fits all Sky- watcher telescope and Vixen telescopes;Celestron another model Main advantages: Universal dovetail base for finder scope: Ideal for custom installation of a finder scope on telescopes not already equipped with a compatible base Please note: There are no attachment screws to hold it to your optical tube assembly it is suitable for M3, M4, M5 or 1/4inch threads screws to assemble for your optical tube;and easy to use and just put it on the optical tube and tighten the screws