Damage Free:No drilling,No screws,No holes,No glue is needed. Use Tips and Attention:This item is a pack of two hooks that works only on non-porous,smooth surfaces such as polished ceramic tile,mirror, glass window,polished stainless still wall and plastic board etc, won't work on any porous,bumpy,rough or textured surfaces such as rough coating surface,unpolished marble or wooden door,rugged porcelain surface etc. Supper Suction and Long Lasting: Made of durable TPU material, sturdy and not easy to rust.Strong load capacity, can hold up to 15kg Easy Installation and Removable: Just a push or pull on the lever handle for lock or loose and it is designed to be removable and reusable for your replacement. Use for non-porous, smooth surfaces such as polished ceramic tile, glass window,polished stainless still wall and plastic board etc