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 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. Complementing any decor, it adds of to your space while keeping the essentials within .