Finally no need to compromise quality for price. Tools4Boards PRECO (Premium Economy) stones feature premium Swiss-made diamond sheet mounted on exceptionally flat precision injection molded polycarbonate backer. Polishing and deburring ability of a stone combined with the cutting ability of a file. Perfect for touching up edges and removing burrs on-hill or to smooth and polish edges after filing. Color-coded backers make it easy to select the proper grit - Black = 100 x-coarse, Red = 200 coarse, Yellow = 400 medium, White = 800 fine and Blue = 1500 x-fine. Unique diamond cluster pattern lasts longer than conventional diamond sheet and is easier to clean. Available replacement PRECO Diamond Sheet fits all PRECO backers, simply peel worn diamond sheet from backer, position and stick replacement sheet in its place.