Extremely strong: Our special manufacturing process gives our suction cups with knurled nuts an unparalleled and long-lasting hold on smooth surfaces such as hallways, windows, and walls, both indoors and outdoors. Easy to install: No drilling, no screws, simply clean the surface, press down, and secure with the knurled nut. Product details: 25 large suction cups. The actual size of the suction cup is 40 mm. Each cup can hold up to 2 kg. Versatile: Our suction cups can be attached to all smooth surfaces such as windows and glass, ceramic tiles, plastic, Formica, etc. Thanks to the vacuum effect, they have strong suction power and are suitable for: + Hanging all kinds of signs: office signs, bus signs, advertising posters + In camper vans: for securing lightweight objects + In the kitchen or bathroom: as a towel rack, for attaching a soap dish in the shower. Your advantages at a glance: Extremely versatile. Exceptional hold. Very high suction capacity. Quick and easy installation.