Here's the perfect tool for easy queen rearing and so much more! The next time you see a queen cell on a frame of brood, just place the whole frame in the Queen Castle with a frame of honey or a feeder....Come back 2-3 weeks later and find your mated queen! Remove the queen from your best hive and when cells are ready place in queen castle. 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 need an 10-frame telescoping top, sold seperately). The Medium hive must be assembled and nails are included.