So, number 5 mesh is apparently about 5 holes per inch, which was just about the exact size I needed. I am making an air powered dryer for my coffee beans, This is small enough that no beans will fall through and with 72% of the aperature open (as they say) I will have plenty of airflow through the column of beans. Being stainless steel is nice, as I will not have to worry about rust. It is sturdy stuff and easy to work with. You will need a good pair of snips to cut it, but welded the way it is, you will not have to worry about "fraying" of the joints.
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