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SIEVE SIZE TO METRIC
4 4.75mm
8 2.36mm
10 2.0mm
16 1.18mm
20 850um = .850mm
30 600um = .600mm
50 300um = .300mm
60 250um = .250mm
100 150um = .150mm
200 75um = .075mm
270 53um = .053mm