The next time you see a queen cell on a frame of brood, just place the whole frame in here together with a frame of honey or a feeder. Come back 2-3 weeks later to find your mated queen!
The Medium Queen Castle (medium frames) can be divided into three 3-frame nucs.
The bottom board provides each nuc with an entrance on separate sides and ventilation from below to help each nuc maintain temperature.
You will also need a telescoping top cover.
The hive body must be assembled, nails are included.