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This is a 200mm diameter BS test sieve with a 425 micron mesh aperture, a standard size in silt/sand..

This is a 200mm diameter BS test sieve pair at 0.425mm and 0.075mm apertures, used for fine aggregat..

This is a 200mm diameter BS test sieve set spanning 2, 1, 0.6, 0.5, 0.425, 0.3, 0.15 and 0.075mm ape..

This is a 450mm diameter BS test sieve with a 0.425mm aperture, for fine sand fractions in particle-..

This is a 200mm woven-wire test sieve at a 0.425mm aperture, a standard size in silt/sand gradation ..