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Sharpening

Diamond Machining Technology Inc (DMT) of Marlborough, Massachusetts, USA leads the world in Diamond Sharpening.
The secret is a single layer of mono-crystalline diamonds set into nickel on a precision ground steel plate that has been injection moulded onto a poly-carbonate base of metal like rigidity and strength.
DMT Diamond Whetstones sharpen fast, stay flat and do not dish or groove.
Even the hardest materials such as Tungsten Carbide are restored to a fine cutting edge in seconds.
There are four colours of whetstone, the colours denoting the grit (mesh) or diamond size.
Green: Extra Fine (1200 grit or 9 micron).
Red: Fine (600 grit or 25 micron).
Blue: Coarse (325 grit or 45 micron).
Black: Extra Coarse (220 grit or 60 micron).