Bending aluminum tubing can be super tricky to form if its 6061-O and really tricky if its T6 like here. Ideally if you can, get 6063 series if you're intending on bending the tube. But if you can only source 6061, shoot for type O, which is annealed, but may still need some heat thrown at it to keep it from cracking. I have an IR temp gun, which is important with aluminum being you dont get any discoloration, but a great alternative way is by using a tempstick or even a sharpie to gauge your ma