The Messermeister 2000/5000 Grit Water Stone is for frequent use to create an extra-fine finish on extreme edges, leaves a mirror polish on the edge. The 2000 grit side is excellent for maintaining a very sharp edge. The 5000 grit side is great for finishing the sharpest edges with a polish. The Messermeister 400/1000 Grit Water Stone is for occasional use to bring back the original cutting angle. It leaves a medium finish to the edge. The 400 grit side will correct slight edge flaws and the 1000 grit side is excellent for both finishing and maintenance. Messermeister designed these two-sided combination water stones to be an economical solution for infrequent sharpening. These stones provide a complete solution to maintaining the sharpest kitchen cutlery at an affordable price. These are great stones to have in the kitchen for those who sharpen only a few times per year.