General description Extremely strong suction cups with knurled nut, designed for a long-lasting grip on smooth surfaces. Ideal for use in hallways, windows, walls, and even outdoors or in bathrooms. Technical specifications Pack of 25 suction cups Diameter: 40 mm Weight capacity per cup: up to 2 kg Installation No drilling or screws required Simply clean the surface, press the suction cup, and secure it with the knurled nut Usage Suitable for all smooth surfaces including windows, glass, ceramic tiles, plastic, and Formica