The DMT D9 Diamond sharpening bench whetstone has non-slip feet and will not break chip crack hollow or groove The D6 whetstone is made from the hardest material which is one of the most efficient sharpening abrasive Available in unique interrupted surface and continuous surface light pressure produces a sharp edge with just a few strokes Use water for lubrication no oil smell or mess and can hone ALL hard materials carbide steel etc and is supplied with Non-skid mat Precision continuous monocrystalline diamond bench whetstones with rubber feet The grit size is etched into the side of the whetstone The grits are denoted by a dual coloured circle which is set into one end Blue Coarse Grade 325 45 micron Red Fine Grade 600 25 micron Green Extra Fine Grade 1200 9 micron