K0 K1 K2 K3 K4 K5 K6
Extra Fine 28~40 28~40 28~40 15~50 28~40 15~25
Fine 40~60 40~60 50~60 50~60 40~60 25~60
Medium-Fine 60~80 60~80 60~80 60~80 60~90 60~80 60~90
Medium 80~100 80~100 80~100 80~120 90~120 80~100 90~120
Coarse 140 140 140 140 150 140 150

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