Outstanding 1.25-inch dual-thread focuser with a 10mm adjustment range, designed for precise focusing in telescopes and long-focus lenses. Compact and design with full metal construction, ensuring rugged durability for long-term use. craftsmanship allows for exceptionally smooth micro-focusing, ideal for observation and astrophotography at extreme magnifications. Inserted CDD eyepieces or finders remain stationary during focusing, performing only linear motion for enhanced stability. High- adjustment with a travel of 10mm and an adjustment of 0.05mm, making it a reliable solution for slow focusing issues. This dual-thread focuser is engineered for optimal performance in various telescopes and finder scopes. Its robust metal construction guarantees durability, while the smooth micro-focusing mechanism enhances your viewing experience. With a travel range of 10mm and precise adjustments, it is perfect for both amateur and professional astronomers seeking to improve their observation and astrophotography capabilities. Color: Image Color Material: Metal Package Contents: 1*1.25 inch double helix focusing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.