whetstone is made of premium white corundum. It has excellent features of self-sharpening. To guarantee the quality, it goes through 17 processes and 3 inspections.
The complete kit comes with one double-sided (#400/ #1500) premium quality whetstone
The low grit side is for refining the dull edge; the high grit is for polishing the edge. Don't throw away your dull knives. If you follow the instruction, you will be surprised.
Suitable for almost all kinds of knives, straight razors, precision tools, planer tools, and chisels, EXCEPT for serrated blades and ceramic knives. It is a PERFECT GIFT for your family & friends.