Queen excluder, metal, 10-frame
The basic function of a queen excluder is to ensure that the queen does not lay eggs in the honey supers. This (usually) ensures the honey within these supers stays clean. Queen excluders are placed in between the brood boxes and the honey supers. They are carefully designed so that worker bees can pass through the screen but the queen cannot as she is too large to fit through the openings. Please note that honey super frames need to be mostly drawn out before a queen excluder is used.