It is said that it is made of high performance ceramic whetgrain that can be easily sharpened with a light press, and it has excellent grinding power for heavy grinding, and of course, it improves the life of the whetstone. It is particularly effective in hard working materials such as casting, stainless steel, and general steel cutting. [Warning] Please use safety gear such as protective glasses and masks to use it correctly and safely. ▲Do not carve wood with foreign objects or remove screws or tables before use. ▲ Please use with the maximum rotation speed.