Features: Special products for beekeeping, suitable for top bar hives, Nuc's, and mating hives. Bee hive box entrance disk is used on a box where there is a round entrance hole. Rotating disc used for controlling access to the entrance of beehives. Designed to adjust the size of the tap-hole in the hive and the hive from the attacks in autumn and winter. Four access options: Fully open, queen exclusion, closed with ventilation and fully closed. Specifications: Material: plastic Color: yellow Diameter: 6.8 cm /2.67inch Package Included: 12 x Beehive Box Entrance Gates