Top Shelf Hardware Premium 1 5/16 Inch Diameter Round Wardrobe Tube Closet Rod with Synergy End Supports. Top Shelf Hardware's Premium Closet Pole adds style and functionality to a hanging section with its unique design and features. Features all-aluminum high-end material and premium quality finishes. includes 2 end caps with rear facing pins with Screws. Note that these are designed to fit into closet systems with pre-drilled holes (5mm diamter) spaced 32mm apart. Sizes are available for 18" , 24", 30", 36", and 48" openings. Note that the rods are cut 1/4" less than the opening width to allow space for the 2 end suppores (Which are ~1/8" each).