These parts are used for curtains. Plastic wheels or steel wheels depending on size and environment. "S" hooks are mounted between the wheels and the fabric eyelets. The stops are put into each end of the rail stop the fabric falling out, the joint is used to lengthen the track to the desired length. There is also a 90° bend. Ceiling and wall fittings are used to mount the curtain rail under the ceiling or against a wall.