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➤Item was made by aluminum with crosshair at the bottom allow quick and precise centering of the optics. Anti-rust, wear-resistant and durable. ➤Fits in 1.25" focusers and easy to use.This collimation eyepiece can be used for precisely collimating the Newtonian and Schmidt-Cassegrain reflector telescopes for better image quality. ➤The inner structure has light eliminating thread, can reduce light reflection to improve clearness of view. ➤Peephole in top and crosshairs at bottom enable precise alignment of reflector optics. Collimation eyepiece is more accurate than the normal collimation tool, can help you better enjoy star.