ProX Header® is a light gauge steel header that provides horizontal and vertical load support. This pre-engineered metal framing component is designed as a 1- or 2-piece steel header that can be used in lieu of 4- or 5- piece built-up (stud and track) headers in both interior and exterior applications, including door and window openings. It also works at any framed opening in the wall, such as an HVAC opening or other wall penetration. ProX Header is made of galvanized steel complying with industry standard ASTM performance criteria for metal stud framing. Members fasten together with No. 8 (interior) or No. 10 (exterior) sheet metal screws (SMS).