Tube support ¸ 12 mm. Nickel brass plug - For 12 mm tubes. "-Brass color finish. -Ideal for closet rods, rod side finishes, etc. -Installation: > 1. Screw the flat part to the cabinet. >2. Insert the bar into the cylindrical part and screw it into the part that we previously screwed. -Article known as: wall curtain rod support, tube to wall support.