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 & Guidescope Kit. Ideal for astrophotography for mounting a guide scope parallel to the main telescope. The mounting bar has two M6 through-holes on both sides for easy adaption to rings. And three threaded through-holes: the center hole has ¼"-20 threads and the two larger holes on either side of center have M8 x 1.25 threads. 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. The adjustment crews have teflon inlays for avoiding unaesthetic scratches and pressure marks on the telescope while still ensuring reliable clamping. The inner diameter of the tube rings is 90 mm for Telescopes between 63 to 89mm tube diameter can be mounted adjustable.

Item Weight: 6.7 Ounces. Finderscope: Reflex. Objective Lens Diameter: 90 Millimeters. Brand: Astromania. Manufacturer: Astromania. Date First Available: October 31, 2016. Is Discontinued By Manufacturer: No. Best Sellers Rank: #49 in Telescope Finder Scopes. Customer Reviews: 4.4 out of 5 stars 28 ratings 4.4 out of 5 stars. Item model number: SKU_AM_AGSRS70. : B07FY5N83F. Item Weight: 6.7 ounces. Product Dimensions: 3.5 x 3.5 x 5.3 inches.