Our Service Columbia markets to a 10 state area in the central United States to building contractors, building materials wholesalers and glass and door wholesalers in the residential and light commercial markets. We market: aluminum storm windows and aluminum storm doors vinyl windows and aluminum windows in single hung, double hung, fixed, casement, horizontal slider configuration aluminum sliding patio doors in bronze and white finish, and white vinyl sliding patio doors mirror closet doors basement windows in vinyl and aluminum a great number of specialty windows such as half rounds, octagons, Hy-lite glass block in aluminum and vinyl, and vinyl garden Windows.