Ball Mill Grinder is a benchtop type Vertical Semi-circular Arc Planetary Ball mill comprised with gear drive mode and variable frequency speed control. Features adjustable rotation speed of 120 to 1160 rpm and revolution speed of 60 to 580 rpm with 1 to 9999 min of adjustable timer. Designed with pneumatic spreaders, cooling fan hole and security lock, has safety cover door with see-through window.