I want to hang some shades on a window encased with square aluminum tubing. I don't know how thick the walls are, so I didn't know if there was enough material for screws to properly bite.I was planning on using #8 tek screws, but I didn't know whether to use 18 or 32 threads.UPDATE: Nvm, I cant find 8-32 tek screws so 8-18 it is. via /r/DIY https://ift.tt/2IUXiJF
