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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 won't necessarily throw off the pointing Mount the Guide Scope to the Top of Imaging Scope: adjustable tube rings for astrophotography.Set of 2 guide scope rings for guide scopes between 43 to 70mm tube diameter. The guide scope rings allow a reliable and above all stable adaption of telescopes parallel to the main instrument. Most common use is astrophotography. With the knurled thumb screws, the guide scope is adjustable and you can centre a sufficiently bright star in the eyepiece or the the autoguider. You can also attach the rings to flat support surfaces like dovetail bars, and get a short adaption to your telescope. Technical Details: Inner Diameter of the Tube:70mm Mounted Adjustable of Range:43mm 70mm Diameter of Metal Screws:Diameter of Metal Screws Guiding Scope Ring Threads:M5 Package Details : 1 x 89mm Dovetail Mounting Plate 1 x Two Tube Rings 1 x Six Nylon tipped thumbscrews