Sieves are round metal frames fitted with brass or stainless steel woven wire cloth. Most meet ASTM E11 or IS 565/3310-1 and are supplied with a certificate of manufacturing conformance. The standard 8″ sieve comes in either full height (2″ above the mesh) or half height (1″ above the mesh). Both are priced the same. The standard 12″ sieve comes in full height (3″ above the mesh), half height (2″ above the mesh), or intermediate height (1 5/8″ above the mesh), and are all priced the same. Please specify height when ordering what height sieve is needed. Back up cloths are available for both standard and wet wash sieves. The back up cloth provides support for fine mesh sieves and extends the life in wet-sieving operations. The support cloth is #20 calendered market grade stainless steel unless otherwise specified.