The inner diameter of the tube rings is 70 mm, compatible with telescopes having a tube diameter between 43 to 70 mm. Adjustable nylon-tipped thumbscrews prevent scratches and pressure marks on the telescope while ensuring secure clamping. Solid metal guide scope rings are designed for finderscopes or guide scopes, featuring knurled metal screws for added grip. The 12 mm diameter screws provide maximum grip for easy operation, even when wearing gloves. The mounting bar includes two M6 through-holes on both sides for easy attachment to rings. Three threaded holes are provided: the center hole is 1/4-20 UNC, and the two outer holes are M8x1.25. Color: black. Material: aluminum alloy. Size: length 89 mm; ring diameter 70 mm. Package includes: 1 x guiding scope ring kit. Other items not included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.