Dual US8-50FS ASTM Test Sieves, 8 in. x 2 in. Brass Frame with SS Mesh, U.S. Standard No. 50. These 8 inch diameter full height brass frame and Stainless Steel cloth U.S. Standard sieves conform to all ASTM E-11, AASHTO T-27 and NBS specifications. 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 stainless steel 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.