Detailed Product Description sifterTest sieve screen surface material according to wire braid is divided into test ... ISO3310-1: 1990 R20 / 3, R20, R40 / 3 series, the screen made of brass, tin bronze, stainless steel. Perforated metal panel ... copper, and made use of electrochemical machining. Test sieve box, screen cover, screen at the end of selection of high-quality stainless steel ...