Japanese honeybee, set of 2 iron 4-sided hive entrances for stacked boxes, for 240mm sumps. For stacked boxes with 29cm to 30cm sides, and sumps with outer dimensions up to 30.3cm (also compatible with 30cm sumps). The hive entrance is 6mm thick and made of iron, so there's no need to worry about hornets chewing through it. 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 adding boxes, we recommend a hive entrance compatible with lifting machines. These are handmade, so there may be slight imperfections such as warping or uneven paint. Please refrain from purchasing if you are overly concerned about these details. We are listing these items to support Japanese honeybee beekeepers and to help increase the number of Japanese honeybees, revitalizing the mountains and fields. We hope these items will be helpful to you. #JapaneseHoneybee #JapaneseHoneybee #4SidedHiveEntrance #StackedBox #Beekeeping #ConcreteSump #InspectionChamber