No damage: no drilling, no screws, no holes, no glue required. Super Suction and Long Lasting: The suction cup is made of high quality ABS plastic and German BASF TUP rubber, which can withstand a maximum load of 13 lbs and maintain suction for many years. Easy to Install and Remove: Just push or pull the lever handle to lock or release, it's designed to be detachable and reusable for you to replace. Tips and Precautions for Use: This product contains two hooks, suitable only for smooth, non-porous surfaces, such as polished tiles, mirrors, glass windows, polished stainless steel still life walls and plastic panels, etc., not suitable for all porous surfaces, uneven, rough or textured surfaces, such as rough coated surfaces, unpolished marble or wooden doors, rough porcelain surfaces, etc.