Genexice Multi-Purpose Hanger Bar with Rotate & Lock Power Gel Suction Cups Innovative suction technology allows this product to install without glue or tools Suction works on any surface that is flat and smooth such as ceramic tile, glass, mirror, granite, quartz, staniless steel, plastic, acrylic, laminate and gloss-coated wood surfaces Suction will NOT work on marble, porcelain, stone, dry wall and wood Comes with six removable hooks that slide across the bar Length: 13", Suction Cup Diameter: 1.75"