A superb upgrade for your Newtonian Telescope, this Low Profile CNC machined 10:1 dual-speed focuser is designed for Newtonian Reflector telescopes of 9" to 15" aperture, and accepts either 1.25" or 2" eyepieces with non marring compression rings. Provides an exceptionally smooth focusing operation with the utmost precision, with the aid of its fine-focusing facility. The 24mm drawtube is etched with a numbered graticule wich greatly aids setting focus positions for astro imaging. (Please note some drilling maybe required on the Telescope tube).