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Interfold with wooden frame and central drill with large 4-inch hole and transparent acrylic plug. It stands out for the new four-inch transparent viewing cap , made of acrylic plastic. Standard measurement of 430x515mm (fixed type hive and transhumance made of 25mm thick wood). The hole has a diameter of 113mm, with a flange diameter of 134mm and a total height of 9mm, it snaps into said hole. Also called a large viewing cap, it is very good for inspecting the hives without removing it, since it is transparent and has a useful visual diameter of about 110mm. Valid for langstroth or dadant US hives.