These dual-grit Nirey Ceramic Whetstones are of the highest quality. The stone(s) you will need depend on the condition of your blades, the degree of sharpness you require, and your budget. Many people can get away with using a 1,000 / 3,000 grit stone and then finishing the edge with a ceramic honing rod (comparable to an 8,000 grit stone). If your knives are quite dull you probably require a 240 / 800 grit stone to repair your edges; the good news is that this means you can skip the 1,000 / 3,000 grit stone and go straight to a 3,000 / 8,000 grit stone for a razor sharp mirror finish edge. Proper sharpening generally only takes about 8-10 passes per edge per grit when correct technique is used. Many people stop at 3,000 grit, which is adequate for most purposes, but going to 8,000 grit will reward you with a durable razor sharp edge that has a beautiful mirror finish. We sell three different grades of two-sided stones: Coarse: 240 / 800 Grit (starting point for very dull knives) Medium: 1000 / 3000 Grit (creating & maintaining a satisfactory edge) Fine: 3000 / 8000 Grit (creating & maintaing a long lasting razor sharp edge) Soak in water before use for a mimum of 5 minutes, periodically reflatten with plate glass and 600 grit paper. Stone is 179 x 60 x 27mm, comes with a non slip base, free shipping anywhere in Australia on orders over $100.