For the safety of the seniors and elderly, please pay attention that the suction grab bars for shower ONLY sticks on smooth and non-porous AIRTIGHT walls which are NOT air-permeable like metal, glass, tile, marble, stainless steel and acrylic but does NOT apply on uneven tile, unfinished marble, wallpaper, dry wall, porous wall, etc. Please don't put all the body on the shower grip. Each suction cup shower handle equips 2 Strong suction cups with locking latches to provide stable protection.The bathtub hand rail ONLY needs to pull down the latches with 5 seconds and the installation is done, quickly and effortlessly! NO drilling, NO screws, NO glue and NO tools are required, fully removable, reusable and causing no damage to your wall.