Fits any eyepiece from 35 millimeter to 60 millimeter in diameter, including telescopes with 1.25 inch and 2 inch eyepieces. The adapter fits any eyepiece from 25 mm to 60 mm in diameter, including most 1.25' and 2' eyepieces. Our microscope accessories are made of quality materials to ensure durability and stability for longterm use. Easy versatility for different devices: Use with microscopes or telescopes to accommodate a wide range of eyepiece sizes without tools. Robust performance: Built to provide stable alignment and reliable fit across daily use in lab, classroom, or field settings. Broad compatibility in practice: Covers common eyepiece diameters found in hobbyist and professional gear, reducing the need for multiple adapters. Durable construction for longterm reliability: quality materials chosen to resist wear and maintain tight tolerances over time. Use scenarios Classroom or lab demonstrations: Quickly swap between eyepieces of varying diameters to illustrate different magnification ranges and optical characteristics without changing equipment. Field and stargazing: Attach to telescopes with 1.25' or 2' eyepieces and use the adapter to accommodate additional eyepiece sizes as needed for different targets. Educational or research settings: Use across microscope and telescope setups to show practical compatibility of eyepiece diameters and the benefit of a single versatile accessory.