Ideal for smooth, dry, flat and non-porous surfaces such as glass doors, mirrors and tiles. Perfect for hanging thick towels, bathrobes, and more in the bathroom or any other area. VERSATILE INSTALLATION: These suction cup hooks are designed for easy installation, no drilling or screws required the , apply the adhesive disc, and attach the suction cup Complementing any decor, it adds of to your space while keeping the essentials within .