These two are a matched pair. They will provide excellent service on all personal or kitchen knives and other cutting edge tools. The double-sided Diamond surfaces are graded 360 and 600 grit – for coarse and semi-coarse sharpening: dull edge, chips in the edge etc. The 360 grit side is also ideal for re-flattening either side of the corundum whetstone by rubbing one surface against the other if the stone ever becomes dished in the middle.
The Carborundum Whetstone is graded as 1000 and 3000 grit. It is used for honing and polishing the cutting edge. Water is the lubricant for all.