Description:- [Applicaton]: Fits in 1.25inch focusers and easy to use;simply cap the telescope, remove the diagonal, and place the eyepiece directly in the focuser.- [Suitable]: For aligning optics of Newtonian reflectors, Dobsonian reflectors, and Schmidt Cassegrain Telescopes (SCTs).- [Feature]: The collimator for mirror (reflector) telescopes has a 45 degrees plate for easier visual accuracy.- [Material]: The Telescope Collimator was made by aluminum with crosshair at the bottom allow quick and centering of the optics.- [Function]: This collimation eyepiece can be used for collimating the Newtonian and Schmidt Cassegrain reflector telescopes for better image quality.Specification:- Accessory Type: Eyepiece- Adapter ring: 2.5 inches- Material: CNC Alloy- Calibration eyepiece: suitable for aligning the Optical shaft of the mirrorPackage Includes:1 Piece Collimating EyepieceNote:Please allow slightly errors due to manual measurement and different monitors.