... .grinder 360 degree free rotating 3.cutting, grinding, milling, drilling and polishing product introduction :1 ... It can not only be used for cutting, grinding, milling, drilling and polishing stones, but ... and down automaticly, easy to operat and ipprove your efficiency.7. Easy-to-use control board ... 5M/minhead degreeany degreehead adjust degree±10°grinding curveany in and side curvegriding head rotation ...