Material: The telescope tube rings are made of metal material, which is reliable in quality, sturdy, and has long service time Telescope Accessories: The telescope tube rings are suitable for professionals and astronomy enthusiasts, fixed main mirror and equatorial instrument, telescope accessories Easy To Install: The telescope tube mounting rings are easy to install and do not require complex steps to complete the installation High Performance: Professional manufacturing telescope tube rings, which are compact and portable, is suitable for 80DX Package Includes: You will receive 1 Pair Telescope Tube Mounting Rings Specification: Material: Metal Size Chart: Inner Diameter8cm/3.15inch Package Includes: 1PairTelescope Tube Mounting Ring (2 pieces) Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia