Dual Manufacturing ASTM 3" Round Brass-Stainless Steel Sieves. Standard depth = 1 inch from rim to cloth. Conforms to A.S.T.M. E-11. Each sieve has an individualized etched serial number and is supplied with a certificate of analysis. Mesh Opening Sizes are listed using standard millimeter (mm), or micrometer (¬µm) descriptions, as well as traditional inch and number designations where appropriate. Brass Frame with Stainless Steel Cloth is a popular choice that offers extended service and cost-effectiveness. Lids sold seperately.