37 Installation, maintenance and repair of metal fences; Installation, maintenance and repair of metal balconies; Installation, maintenance and repair of metal stairs; Installation, maintenance and repair of metal railings; Installation, maintenance and repair of metal gates; Installation, maintenance and repair of metal artwork; Installation, maintenance and repair of metal sculptures; Installation, maintenance and repair of metal doors; Installation, maintenance and repair of metal windows; Installation, maintenance and repair of metal furniture; Installation, maintenance and repair of metal signs; Installation, maintenance and repair of metal walkways; Installation, maintenance and repair of metal arbors; Installation, maintenance and repair of metal arches; Installation, maintenance and repair of metal awnings; Installation, maintenance and repair of metal canopies; Installation, maintenance and repair of metal gazebos; Installation, maintenance and repair of metal pergolas; Installation, maintenance and repair of metal sunshades; Installation, maintenance and repair of metal trellises; Installation, maintenance and repair of metal siding; Refinishing of metal products; Refurbishing of metal products; Applying decorative coatings to metal; Applying protective coatings to metal; Metal drilling and perforation