This mouse guard for beehives serves as an entrance closure and reducer, as well as a mouse guard. It is easily adjustable to the right size for the hive entrance on 8 and 10 frame hives. Place it over the entrance to hive with the large openings down and you have a mouse guard for winter. Flip it over and you have an entrance closure for moving hives. In this position you can slide the adjuster to create a small opening if you want a reduced entrance for smaller colonies. We recommend attaching with small push pins for easy removal. When not needed the narrow profile and aluminum materials mean you just attach it to the hive body out of the way, and it is right there next time you need it!