1” Aluminum angle is what I used on my remodel, held down with black flat head screws. I used 220 grit sandpaper on it for a desired look, some of the angles were tricky depending on your flooring detail, I used a mitre saw and pieces of 2X4 to block up the aluminum when cutting, I found a wider threshold trim at HD for the carpet/floor transition up front that worked and cut it to size.
'03 Ford E350 7.3L Diesel
(de)SMB'd Custom RB-50
Quigley 4X4 w/Deavers & Agile Offroad's R.I.P. package
CCV High Profile Pop Top