I have other items for sale as well #miaGoods If the items can be shipped via Packet Plus, you can get a 200 yen discount for combined purchases. This is a set of two knife sharpeners. From the handle side, the grooves are ① coarse sharpening, ② medium sharpening, and ③ finishing sharpening. It's advertised that you can restore excellent sharpness by simply pulling the knife towards you a few times in the order of ①-③.