Building wall framing made primarily of metal; roof framing and trusses made primarily of metal; metal windows and doors; metal windows and door hinges made of metal; metal window frames; fire-rated metal window frames; fire-rated metal door frames; door frames of metal; skylight frames made of metal; fire-rated skylight frames made of metal; metal door panels; door panels of metal; aluminum and stainless steel framing materials, namely, wall frames, wall panels, and skylight frames of metal ...