These suction cup hooks are ideal for use in bathrooms, especially inside showers, as well as on windows, glass, mirrors and tiles. They are designed for hanging towels, bath robes, loofahs and other items, featuring waterproof and rustproof performance. Adopting Vacuum Lock Pro Seal Technology, they come with a super sticky silicone base and advanced vacuum suction technology to provide strong and reliable support. You only need to turn the hook rod clockwise to eliminate air and maximize suction power, with each hook capable of holding up to 15 lbs. No drilling or screws are required, so they won’t cause any damage to walls. The Twist and Lock mechanism makes installation quick and easy, suitable for various scenes such as organizing utensils, coats, hats, wreaths and RVs. Installation takes just 3 simple steps: clean and dry the smooth non-porous surface, loosen the hook counter-clockwise to take out the suction cup base, then press the base against the surface and twist the knob clockwise until tight. They are made of stainless steel and super silicone, which can withstand daily steam and water splashes, and can be removed without leaving any residue. They are suitable for glass, mirrors, glossy porcelain tiles, acrylic, plastic, smooth stainless steel, quartz, laminate and other smooth non-porous surfaces. Color: Silver.