GP15101 Diamond Hand Sanding Pad for Sanding, Grinding, Polishing and Sharp Edges/for Glass, Stone, Marble, Concrete/A+ Class/GRIT 400 - Fine Size: 3.7 x 2.1 inch / Thickness 1.1 inch GRIT 400 FINE / Electroplated Diamond Hand Pad For hand Sanding, Grinding and Polishing cut edges of hard surfaces, Can be used for Glass, Marble, Stone, Tiles, Concrete Can be used wet or dry