Steel members are also used to construct the entire internal steel structure (frame) of a house through the use of a typical stud framing system. Steel studs are similar to timber studs in size and shape and are available in regular (rectangular) and open stud (square C shape) sections. This steel structure is galvanized to protect it against moisture. Steel structures are strong, durable, lightweight and non flammable, making it a great choice for fire-prone areas. Many steel members used in the erection of steel structures are fabricated with pre-drilled holes for ease of installation. This in turn saves time and money.