As seen used on our mini mating nucleus colonies (W1044/W10860)
Designed to suit entrances of nucleus and queen rearing beehives.
Advantages of using hive escape wheel such as this.
They can deter pests and predators like ants, robber bees, and yellowjackets by making the entrance more difficult to penetrate.
Entrance reducers can protect a weak hive from invasion by making it easier for a smaller number of bees to defend the entrance.
Allowing for control of bee passage including open to allow for mating flights / free entrance of queen, restricition of worker bees and restriction of the queen.