Brass frame, full height, 12" diameter testing sieve USA Series (NIST size) No: 3-1/2 ASTM Sieve Opening: 5600 microns Tyler Mesh: 3-1/2 Sieve Opening: 0.223 inches Wire Diameter: 1.68 mm Overall Height: 4-1/4" Depth to cloth: 3-1/4"