DT-DIATOOL 9pcs 4 inch Diamond Floor Polishing Pads Sanding disc for concrete cement terrazzo Grit 200 Diameter 4 Inch/100mm, Total thickness 9mm, workable thickness 6mm; Diamond Grit 200 Suitable for processing, repairing and renovating concrete floor, cement floor, terrazzo floor. Dry or Wet Grinding or polishing, wet working could be get better performance. Strong grinding force, good durability. Recommended RPM: 2500RPM.Maximum RPM:5000. DT-DIATOOL 9pcs 4 inch Diamond Floor Polishing Pads Sanding disc for concrete cement terrazzo Grit 200