70mm metal I stud is a type of metal framing material that is used to create non-load-bearing interior walls. It is made from galvanized steel and has an I-shaped cross-section. The flanges of the I-beam provide strength and stiffness, while the web helps to prevent buckling. 70mm metal I studs are available in a variety of lengths to accommodate different wall heights. They are typically spaced 400mm - 600mm apart on centre, but this spacing can be adjusted depending on the specific application and size of boards used. The studs are attached to the floor and ceiling joists using metal tracks.