This diamond powder plate is great for repairing your knives, but a bit harsh and aggressive  for sharpening your kitchen knife blades. At DOMA we use it  as a planer to repair the surface of worn stone.
 
The sharpening stones become hollow (generally in their center) with use, to properly sharpen your knife, you must plane the surface of the sharpening stones and les maintenir planes.
There are special stones for planing, but these can also deform with use which sometimes makes the task complicated.
 
The diamond is not only extremely hard and very abrasive, but the plate remaining flat, it planes easily and faster than with a stone. 
This #400 grit will allow you to plane even fine polishing stones, without damaging its surface and without removing more material than necessary.
 
 
Grain #400 
Dimensions: 21x7.8x1cm