U.S. Standard, full height, brass frames. 8 diameter, 2 depth to wire cloth. Brass cloth is used in No. 18 and coarser; phosphor bronze cloth in No. 20 and finer. ASTM E-11, AASHO T-27 and conforming to NBS Standards. Each Test Sieve is supplied with a Serial Number and a matching Test Sieve Certificate of Compliance.