1Eyepiece construction: Wide angle and long view relief, providing more complete field of view and comfortable viewing experience. 21.25 inch 10mm eyepiece, provides the widest field of view with additional clarity and long view. 3Full metal body, full surface multi-layer coating, high quality optical performance. 4Soft rubber eye protector goggles, standard 1.25 inch thread. 5Sky and ground dual purpose, suitable for all astronomical telescope(31.7mm interface), used for astronomical observation of the surface of the moon, planets, nebulae, star clusters, dispersion nebulae and other heavenly body, high brightness, large field of view, very comfortable observation.Condition: 100% Brand New Item Type: Monocular Eyepiece Material: Metal Color: BlackCoating: FMC Full Multilayer Wideband Coating, High Definition Fitment: for All Astronomical Telescope(31.7mm/1.25inch Interface) Weight: Approx. 73g Focal Length: Approx. 10mm/0.4inch, Medium and High Power Eyepiece Size: Approx. 5x4cm/2x1.6inch1 xMonocular Eyepiece1 xStorage Box