Diamond whetstone, for quick and easy sharpening of knives, chisels, scissors, cutting blades and other edged implements. Combination of 400 and 1000 grit surfaces. Whetstone will sharpen carbon steel, high speed steel (HSS) and tungsten carbide. Can be used wet (with water as a lubricant) or dry. Supplied with an adjustable robust non-slip holder which can be used with stones from 135mm to 215mm in length.