I've seen (in build pics) an aluminum edge trim made for roof edges. It's basically L shaped in profile, can be bent on a radius and has a filler plastic strip that slide in and covers the screw heads.
First, what is this called?
Second, what lengths does it come in?
Third, who sells it?
Forth, how much does it cost?
I live in central Alabama...are there any suppliers in or around Birmingham?