Versatile compatibility This 1.25 inch focuser is designed for Newtonian reflective telescopes and offers multiple size options for inner tube diameters from 60 mm to 145 mm to ensure you find the perfect match for your astronomical setup. Precision focusing Equipped with steel shaft gears, this focuser provides smooth and accurate adjustments, allowing you to achieve crystal clear view of celestial objects with ease and precision. Sturdy construction Made of high quality ABS plastic, this telescoping pull-out combines lightweight design with long durability, withstands frequent use and adjustments during your stargazing sessions. Easy installation With focusing lengths from 66 mm to 120 mm, this focuser is easy to install and compatible with various eyepiece interface specifications, including 0.965 inch (24.5 mm) and 1.25 inch (31.7 mm). Use scenarios - Visual observing: quickly dial in sharp focus on the Moon, planets, and bright deep-sky objects using standard 1.25 inch eyepieces. - Astrophotography and imaging: stable, repeatable focus with convenient interface options for adapters and cameras. - Newtonian upgrades: simple installation expands compatibility across a range of tube diameters and eyepiece interfaces for existing and future accessories.