This hand piece micro grinder is designed for precision processing with low core distortion for rotational accuracy. The 0.09 inch (2.35 mm) shaft allows you to attach and detach the tip tools with one touch. (Inner collet for 0.1 inch (3.0 mm) sold separately) The controller also has a built-in power up to 35,000 rpm (max) and includes a forward and reverse function. Convenient foot switch and handpiece stand are also included as standard. Perfect product for precision machining. The tip tool can be replaced with a single touch. The tip tool can be replaced by using a wrench has been a one-touch. Instantly change tip tools so you wont interrupt your work. High precision hand piece for precision processing; 2 ball bearings are adopted in the spindle and 2 in the power part; 4 ball bearing supports for precise rotation. Comes with a standard foot switch and a variable foot switch that can be used with the controller for speeds. Since both hands are free, you can improve your work efficiency, and you can safely focus on your work.