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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