The two-stage pipe bed is overflowing in the streets cheaply but it becomes difficult at once because it becomes three stages, so if you make it yourself, buy it, truly when you reach 3 stages the upper stage will shake even in metal joints, the number of pipes and braces etc. I thought that it was necessary to devise some additional purchase so it seems to be additional purchase.
It is used for fixing the monitor stand and the speaker of the personal computer. Building a building of 350 mm from the top of a commercial PC desk, we designed it to jump 400 mm horizontally from there and used it for this intersection. The monitor was 4.8 kg, the speaker was about 2.2 kg, but although it was slightly shaken and attached with grafting, it could be fixed to the extent that it is practically unnecessary. Also, unlike plastic joints, positioning is easy since it can be adjusted by slightly loosening the bolts even after all assembling. I am sorry if the price is a bit cheaper. . .