The Rix Roof Vents are designed to represent many types of vents found on buildings and factories all across the country. The Rix Roof Vents are made so that a variety of different styles can be made. The swivel base allows the vent to remain plum when mounted on a peaked roof. Kit includes enough parts to produce a total of eight vents. Four swivel bases are also included. Vents are molded in white plastic.