This high quality, single-speed 1.25" Crayford focuser for reflector telescopes from Guan Sheng Optical (GSO) is a joy to use. You will wonder how you ever lived without it once you install it!  It will greatly aid in achieving precise focus for visual observations and astrophotography and you will experience very smooth and precisely controlled focuser motion with zero backlash and zero image shift. 
CNC machined from aluminum and anodized black, this focuser comes with a base plate to attach to your reflector telescope.  The inner drawtube glides on 4 precision bearings and a roller shaft and provides 47mm of focus travel. The inner barrel is baffled and painted a flat black to minimize reflections for maximum contrast.
The features: 
Ultra smooth focus motion
Constant movement