MuswellMetro
Queen Bee
Some queen excluders have the wrong spaces, so the bees can't get through them. Some imported ones are worse than useless, and there were some plastic ones sold by he big suppliers a couple of years that were no good.
agree, Bees do also come in different sizes, i had black bees that never when through any of the plastic type QX and an orange Queen that seemed unhindered by a wire QX