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Hardware cloth in beekeeping

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Michael Bush:
https://bushfarms.com/beeshardwarecloth.htm
Uses of different designations of Hardware Cloth in Beekeeping
The #x is how many wires there are to an inch of hardware cloth. So #4 has four wires to the inch. Sometimes called 1/4" hardware cloth. The openings are the # minus the thickness of the wire.

What hardware cloth to use
#8 - no bee can pass. pollen gets stuck.
#7 - as long as there are no bent wires, no bee can pass. Pollen falls through. Good for the bottom of a pollen trap to let the pollen fall into the tray.
#6 - worker bees can squeeze through (and will) but they have to wiggle and squirm a lot. Drones and queens cannot.
#5 - worker bees can squeeze through easily but lose some of their pollen. Queens and drones cannot. Good for a pollen trap to force the workers through.  Used in Africa and other 3rd world places as a queen excluder.  Can be made into a "push in cage" to confine the queen.  In Africa this is also called "Coffee cloth".
#4 - all bees can pass (workers, drones and queens). The workers sometimes lose some of their pollen when they catch their basket on the wire. (mice cannot and this makes a nice mouse guard)

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