When sharpening knife with sharpening stone, this tool keeps the most suitable angle to sharpen a kitchen knife.
This item has TWO SLIT for large and small knives.
The small slit for petty, paring knives... The big slit for Santoku, Chef's knives...
unusable: single bevel knives ex: Yanagiba / Sashimi , Deba...
Material :Ceramic / PP resin
Made in Japan