... marble, granite, limestone slate, sandstone, travertine and so on. SpecificationsDiamond abrasive brush 1.Polishing granite surface into leather-look . 2.Type ... : Frankfurt ,Fickert and Round 3.Grit:30# - 500# Diamond Abrasive Brush are used in marble, granite, limestone slate, sandstone, travertine ... .Grit:30#, 40#, 60#, 80#, 120#, 180#, 240#, 320#, 500#. Abrasive plastic &steel Frankfurt brushes