Specification Brand : EBTOOLS BulletPoint1 : Fine Tuning: The gear can be fine tuning. The telescope has an 80mm aperture. You can adjust the length by the gear. It has a focusing length of 120mm and is compatible with 1.25 inch eyepieces. And fine tuning more accuracy, even at high magnification, ensuring smooth and stable observations. BulletPoint2 : Secure Locking Screw: The side is equipped with a locking screw that securely holds the eyepiece in place, ensuring stable and steady observation. BulletPoint3 : Internal Anti Reflection Design: The interior of the focusing seat is designed with full threads to minimize reflections and maximize image quality. BulletPoint4 : Easy Installation and Operation: Convenient to use, suitable for smooth focusing on reflector telescopes. BulletPoint5 : Versatile: Suitable for DIY refractor telescopes. Made of Sturdy ABS plastic material, ensuring a longer lifespan. Color : 25mmSecondary Mirror Finderscope : Reflex FocalLengthDescription : 900 millimeters ItemName : 80mm Refractor Focusing Seat, Fine Tuning, 1.25 Inch Eyepiece Interface, Secure Locking Screw, Internal Anti Reflection Design, for DIY Refractor Telescopes ItemPackageDimensions_Height : 9 centimeters ItemPackageDimensions_Length : 18 centimeters ItemPackageDimensions_Width : 12 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : refractors Manufacturer : EBTOOLS ModelName : EBTOOLSde1gn3muhb ModelNumber : EBTOOLSde1gn3muhb PartNumber : EBTOOLSde1gn3muhb ProductDescription : 1. Fine Tuning: The gear can be fine tuning. The telescope has an 80mm aperture. You can adjust the length by the gear. It has a focusing length of 120mm and is compatible with 1.25 inch eyepieces. And fine tuning more accuracy, even at high magnification, ensuring smooth and stable observations. 2. Secure Locking Screw: The side is equipped with a locking screw that securely holds the eyepiece in place, ensuring stable and steady observation. 3. Internal Anti Reflection Design: The interior of the focusing seat is designed with full threads to minimize reflections and maximize image quality. 4. Easy Installation and Operation: Convenient to use, suitable for smooth focusing on reflector telescopes. 5. Versatile: Suitable for DIY refractor telescopes. Made of Sturdy ABS plastic material, ensuring a longer lifespan.