Robbing Screen,the concept is simple. Close off the lower entrance and open the upper entrance. The resident bees begin to use the upper entrance. The piece of metal helps hide the pathway that is being used by the resident bees to go and come from the colony.
It is always best to add these screens before robbing gets started. Install your Robbing Screen when the bees are in for the day, either early in the morning or late in the evening. This will allow resident bees to learn the new entrance and not trap them outside the colony.
Choose for 8-frame or 10-frame hive equipment.