James,
Most standard SBB are made with 1/8" hardware cloth. You mentioned
juvenile small hive beetles falling through, as far as I know once
they are adults the size does not change. Male beetles are the
smaller ones and females are the larger ones. If you want female
beetles to fall through and not bees falling through you need what
they call #6 hardware cloth or 1/6 inch mesh or 6 squares per
square inch. I've looked for good sources and think this might be
one
http://www.twpinc.com/wire-mesh/TWPCAT_30/p_006X006A0350W36T
Cheers,
Randy Emmitt
Rougemont, NC
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