Detailed Product Description Instructions for use:1) Operation speed:600-950rpm;2) Refresh the cooling water adequately,Preventing grinding disk or diamond sand from deterioation,But little water for Polisihing Disks{final polish};3) Grinding or Polishing sequence:[50#,100#,200#,400#,500#,800#,1500#,3000#,polishing disk];4)Diameter:3",6",8",10".