Ipegtop Strong Suction Rustproof Stainless Steel Square Shower Caddy Shelf Storage with Double hooks Suction Cups Basket for Bathroom Kitchen Organizer Suction will NOT work on stone, wood, sanded tile, porcelain, marble, dry wall & any surface that is bumpy, porous or matte finished. Innovative rotate and lock suction technology and UPDATED SUCTION CUP WITH BLACK GLUE allows this product to install without tools,it's easy to install. Made of SUS304 stainless steel,GUARANTTE NOT TO RUST Product Dimensions:9.3 x 4.9 x 5.90 inch Simply position on a smooth and clean surface, apply pressure and turn clockwise(ceramic tile, glass,stainless steel, acrylic, laminate,etc...) mirror, granite