1)Metal bond 4'' floor grinding diamond tool 2)Segment thickness:12mm 3)Grit 30,50,80,150,300 4)Higher diamond ratio 4" unique ... quality metal bond floor grinding diamond tool ----- We supply ... . Grit no. covers 30,50,80,150,300, or customized4. 4" or customized sizes5. The exclusive thickness 12mm represents high quality ...