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 *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm