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.