Matters need Attention: Only suitable for tiles measuring 4 4 inches or larger. 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, painted wall, etc. Please don't put all the body weight on the shower grip. Easy for Installation: Each suction cup shower handle equips 2 Strong suction cups with locking latches to provide stable protection. The bathtub hand rail is fully removable, reusable and causing no damage to your wall. Safety to Users: Each shower bar's safety is fabricated with an Anti-Slip Strip on top of the handrail, which creates strong friction to better keep your hands ON the grab bar.