- Designed for telescopes with tube diameters ranging from 34 mm to 85 mm, these tube rings feature an inner diameter of 90 mm, providing a secure and adjustable fit. - The adjustment screws are equipped with Teflon inlays, preventing unsightly scratches and pressure marks on your telescope while ensuring firm clamping for stability during use. - Constructed from solid metal, these finder-guide scope rings are perfect for compact telescopes and finders, featuring a flat support surface and knurled metal screws for enhanced grip. - Each ring and base is designed with a flat surface that includes four female M6 threads ("Inner pair 20 mm - outer pair 38 mm"), making it easy to adapt to dovetail bars or clamps. Large screws provide maximum grip for effortless handling, even when wearing gloves. Use Scenarios: - Ideal for amateur astronomers who need a reliable mounting solution for their telescopes while ensuring easy adjustments during viewing sessions. - Perfect for astrophotographers looking to securely mount guide scopes without risking damage to their equipment. - Suitable for telescope enthusiasts who frequently switch between different setups and require a versatile, user-friendly mounting system.