USA Standard Testing Sieve, Wire Cloth Test Sieve, Stainless Steel Screen Material, Brass Frame Material, Mesh Size 1 1/4 in, Mesh Size Range Coarse, Wire Dia. 4 mm, Opening Size 31.5 mm, Outside Dia. 12 in, Frame Inside Dia. 12 in, Overall Depth 3.25 in, ASTM E11 Standards