Tatkraft Megalock Bathroom Shelf Shower Caddy Organizer Suction Cups Chrome Plated Steel 12X6X6 SIMPLE MOUNTING SYSTEM - For smooth polished, glass or tiles surface only! Easy installation - no screws, no nails, no glue, no tools! Secure and easy fixing on any smooth surface: tile, glass, metal, plastic, mirror Strong vacuum pressure due to a combination of special rubber and a steel disc Resistant to changes in temperature, moisture proof. High durability of chrome plated coating ATTENTION - Will not adhere to unfinished marble, porous or rough surfaces (eg porous painted walls), or across grout lines