Dual US3-120B ASTM Test Sieves, 3" x 1" All Brass Frame with Brass Mesh, U.S. Standard No. 8. These 3 inch diameter with standard 1 inch height brass frame and brass cloth U.S. Standard sieves conform to all ASTM E-11, AASHTO T-27 and NBS specifications. Optional half height depths are available. Each sieve is supplied with an engraved serial number and a test certificate for complete traceability. The sieves are constructed of metal frames which are seamless and have extended bottoms. The brass sieve cloth is mounted without distortion and the joints are smooth to prevent catching of material. Sieves of the same diameter can be nested on top of each other.