Wedding alley wheels, diameter 50 mm. Wedding alley wheels are mounted on the outlets.
Thanks to the use of the wheel, the beekeeper has the option of: opening the alley, closing the alley, closing the alley with a ventilation hole, and opening the alley with free passage of bees, excluding the queen bee and drones (they will not fit due to the opening being too small).
Wheel diameter 50 mm.