Standard Test Sieve diameters include 4", 8", 12", 200 mm, and 300 mm. Special application products are available in 6", 10", and 18" diameters and include Air Jet and Wet Test designs. All Test Sieves are fabricated in brass and durable brass meshl. Our premium quality sieve cloth, is produced to the very tight tolerances, providing consistent repeatable analysis. Standard openings per international specifications range from 5" (125 mm) down to 20 um (micron).