I live in Brazil, some people call us as a Third World country, but I work with a CNC Bender machine to make our letter signs, and I can use this type of aluminum, the machine can deal with that clip at the top easily. But I prefer to use flat profiles, that allows me to make letters with infinite borders. It's cleaner and sophisticated.
Flat aluminium channels are good for small sized letters. With our F profile aluminium channels you can easily make gigantic sized letters. Please chat on WhatsApp for more details +91 9029062419.