SVBONY Collimator Eyepiece 1.25" Metal Without Laser for Newtonian Reflector Telescope Collimation eyepiece help you align your reflector telescope easily and quickly;make alignment no longer boring and time consuming Fits in 1.25" focusers and easy to use;simply cap the telescope;remove the diagonal;and place the eyepiece directly in the focuser This item can only be used if your refractor telescope cell has a push pull or other mechanism to adjust the lens elements;It will be of no use with fixed cell objectives that cannot be adjusted Best quality solid metal material;strong and durable structure;long lifetime Lifetime warranty;we confidently promise lifetime warranty for each one from us