Feature:1. Aluminium Alloy: This reflector telescope eyepiece is made of aluminium alloy, which ensures long service life.2. Easy Operation: This metal collimating eyepiece is suitable for 1.25in focusers. simply cap the telescope, remove the diagonal, and place the eyepiece directly in the focuser.3. Quick Centering: This reflecting telescope eyepiece has crosshair at the bottom, which allows quick centering of the optics.4. Portable Size: This collimating Cheshire eyepiece is short and portable, and it features easy installation and operation.5. Better Image: This reflector telescope eyepiece can be used for precisely collimating the Newtonian and Schmidt Cassegrain reflector telescopes for better image quality.Specification:Item Type: Reflector Telescope EyepieceMaterial: Aluminium Alloy, Optical GlassInterface Size: 1.25in (31.7mm).Package List:1 xReflector Telescope Eyepiece