Forstner drill bit Gridfinity Box stackable

There are many Gridfinity boxes for Forstner drill bits, but none that can be stacked and thus fit into a small box. So here is my version for storing 16 Forstner drill bits from 15 to 35 mm.Ideal if you only need the drill bits once in a while, like me. Based on a 3x4 Gridfinity grid.The large box is 6 units high, the small one 4 units. The box in the photo is not included, but any other Gridfinity box with the above dimensions will work. :-)