Japanese honeybee, for stacked boxes, iron four-sided entrance, for 240mm water collection basin. For stacked boxes and water collection basins from 28cm to 29.3cm square. The entrance is 6mm thick and made of iron, so there is no worry of being chewed by hornets. The color is silver, but it can be changed to black upon request. Please specify in the comment section after purchase. If you are considering a lifting machine when stacking boxes, we recommend an entrance compatible with a lifting machine. As it is handmade, there may be some distortion or uneven paint. Please refrain from purchasing if you are sensitive to such imperfections. We are selling this to support Japanese honeybee beekeepers and to hope that the Japanese honeybee population will increase and the mountains and fields will become vibrant. We hope it will be helpful to everyone. #JapaneseHoneybee #NihonMitsubachi (Japanese Honeybee) #FourSidedEntrance #StackedBoxes #Beekeeping #ConcreteBasin #InspectionChamber