The OXO StrongHold Suction Hook keeps your favorite shower items close at hand. The StrongHold suction cup installs tool-free, providing secure storage on smooth, non-porous surfaces. Need to adjust? A flip of the lever releases the seal for repositioning or removal. The silicone-coated hooks stay non-slip, even when wet, perfect for razors, washcloths and more. For best results, use on smooth glazed surfaces, mirrors or glass. Not recommended for use with textured or porous surfaces including some stone, acrylic or metal.