this tablet has no internal rods, it's just two slots for screws. it's my fault I did not pay attention. Random installation because after drawing on the wall hole locations, put ankles, installed screws (not included) shelf positioning. undo turn the screws for a ride, try again ect ... once found the right length, type Built by hand to the tablet but not too hard as this distorts the top of it and crack it (and yes it is a kind of "hardboard" of 4 mm thick pasted on a coarse chipboard) ikéa product made in Poland. very expensive for the quality. 25.24 euros shelf x30 cm 30 cm.