These Black Malleable Iron Floor Flanges have one female-threaded connection, allowing the user to attach it to a length of male-threaded black iron piping. This floor flange has four bolt holes, allowing it to be attached to floors, walls, or ceilings. Black iron is resistant to rust and corrosion, so it can be used in gas and oil supply lines. Another common application for floor flanges is running wires. Please note: Image may NOT be accurate representation of actual size of product. | Worldwide Sourcing Black Floor Flange | Size 3/4"