The basics These rectangular dividers never fall off; they are made with break resistant plastic with beaded edges to retain their rigidity.  The benefits These dividers are blank giving you the option to use them as size dividers or clothes separators. The specs - They are 3 3/4" wide, 9 5/16" high and 3/16" thick. - Fits any round or square tubing rolling rack and/or hangrod up to 1 1/4". - They need 3 1/4" clearance above the hangrail.