Features: 1. The inner diameter of the tube ring is 70mm, suitable for telescopes with diameters between 43-70mm, and can be installed and adjusted 2. Adjusting the nylon head finger screw can avoid unsightly scratches and indentations on the telescope, while still ensuring reliable clamping. 3. Solid metal ring with rolled metal screws for Finderscope or Guidescope 5. There are two M6 through holes on both sides of the installation rod for easy fitting of the circular ring. 6. Three threaded through holes: the center hole is UNC 1/4-20, and the larger holes on both sides of the center are M8x1.25 specifications Brand SVBONY Model SV116 Inner diameter of pipe 70mm Installation adjustable range 43mm-70mm Metal screw with a diameter of 12mm and a rolling pattern Guide mirror ring thread M5 Plate thread M8 UNC1/4-20 M6 Color: Black Net weight 168.45.94oz Package details 89mm dovetail mounting plate Double tube ring Six nylon head finger screws