Tatkraft Magic Hook Chromed Bathroom Hook Suction Cup 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 Vacuum power, spherical lens ATTENTION - Will not adhere to unfinished marble, porous or rough surfaces(eg porous painted walls), or across grout lines