You guys seem to be fairly confused. The reason you are all confused is that like all wire mesh, each size comes in about 12 different "aperture opening sizes". One person buys #6 and it works, another buys #6 and all the bees get through it. same for #7 or #8.
You need to shop for your hardware cloth by "aperture size" not by mesh #
We sell exclusively #6 mesh with an average aperture of 3.2mm (this is called 6mesh 041) in the industry. Because it has 6 openings per inch (#6) and uses 0.041" (041) wire for the weave, resulting in an opening or aperture of 3.2004mm. For hive beetle traps you MUST use a wire mesh with an average aperture of 3.2mm
If you need this mesh, we are a supplier.