Astromania Adjustable Guiding Scope Ring Set with Plate - 80 mm Inside Diameter (Pair) - for Telescope Tube Diameter or Finders 53 to 79mm

The inner diameter of the tube rings is 80 mm for Telescopes between 53 to 79mm tube diameter can be mounted adjustable The adjustment screws have teflon inlays for avoiding unaesthetic scratches and pressure marks on the telescope while still ensuring reliable clamping Solid metal guide scope rings for compact Finderscope or Guidescope with knurled metal screws; big screws with maximum grip allow easy use - even with gloves Synta-style dovetail mounting bar; it has two M6 through-holes on both sides for easy adaption to rings; and three threaded through-holes: the center hole has 1/4inch - 20 threads and the two larger holes on either side of center have M8 x 1.25 threads Set: pair of two tube rings made of metal; the Astromania guide scope rings are suitable for small and medium-sized guiding telescopes eg; Astromania 70mm Compact Deluxe Finder and Guidescope Kit; ideal for astrophotography for mounting a guide scope parallel to the main telescope