Gthunder Suction Cup Hooks Holder - Super Strong Suction Cup Hook - Buttoned Bathroom Kitchen Vacuum Stainless Steel Suction works best on GLAZED TILE, SMOOTH GLASS, MIRROR, SMOOTH GRANITE, SMOOTH STEEL PLATE, SMOOTH PVC FLAT(acrylic), laminate and any non-porous SMOOTH surface,please check your wall style. 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 allows this product to install without glue or tools,it's easy to install. Self-draining storage for all your shower essentials Dimensions:5.6 x 4.8 x 3.8cm(2.2x1.89x1.5inch)