This HT-65 PRO features a #1000 grit whetstone and a S-1 (#6000) – King S-1 Fine Sharpening Stone. It is made exclusive for Japana. Use the #1000 grit whetstone to restore a dull edge to a sharp one. And the S-1 (#6000) whetstone to put a mirror polish on the back and bevel of the blade. These waterstones (whetstones) are ideal for working blades that are dull and are not damaged. Made from abrasive particles suspended in a bonding compound. The stones cover two consecutive stages in the sharpening process. Dimensions of the whetstone are 207mm x 66mm x 34mm (#1000) and 210mm x 73mm x 22mm (S-1 #6000).