Item Type: Telescope Eyepiece Material: Aluminum alloy and optical glass Interface Size: Approx. 31.7mm / 1.25in 1OPEN AND PRACTICAL: This is a high medium magnification eyepiece with a wide field of view, superior performance and excellent optical performance 2UNIVERSAL SIZE: Standard 1.25in/31.7mm eyepiece, a universal accessory for astronomical telescopes 3CLEAR COATING: Eyepiece use FMC full multilayer wideband coating, excellent optical glass, providing maximum brightness, high clarity 4SUITABLE THREAD: All metal body eyepiece, bottom extinction thread can be turned 1.25 in filter, can be used with standard 1.25in interface telescope or filter 5APPLICATION SCENARIO: Eyepiece is used for astronomical observation of moon surface, planets, nebulae, star clusters, diffuse nebulae, with high brightness and large field of view, and very comfortable to observe 1 x Telescope Eyepiece 1 x Storage Box