30Pcs Set Diamond Whetstone Knife Sharpener for Edge Sharpener

When polishing, choose 1000 1500 2000 grain if you grinding, 600-800 grain if you make coarse grinding, 80-500 grain. The diamond stone is smooth, it uses a single crystal diamond, to wear, long lasting. 10 different pieces of stone grain 80, 120, 200, 400, 500, 600, 800, 1000, 1500, 2000 GRAIN.