This red dot finder rdf comes with a stalk and quick release bracket to fit the altair starwave tm refracting telescopes and most other telescopes by means of the universal base it can be attached to the starwave tm focuser by means of two included m4 screws everything you need is included to attach the finder scope bracket to the focuser the rdf unit is high quality made from metal uses a cr2032 battery and has variable illumination with a choice of 3 reticules single dot cross hair