Extreme Grip: Our special manufacturing process allows our suction cups with knurled nuts to hold firmly and durably on smooth surfaces such as tiles, windows and walls, or outdoors or in the bathroom Easy to assemble: No drilling required, no screws required, just clean the surface, press and fix with the knurled nut. Product details: 20 large suction cups. The actual size of the suction cup is 40 mm. Each cup can hold up to 2 kg. Multifunctional: Our suction cups can suck on all smooth surfaces such as windows and glass, tiles, plastic, formica and more. Pack of 20 suction cups with 40 mm M4 thread - transparent suction cup knobs with knurled nut. Thanks to the vacuum effect, they have a powerful suction and are suitable for fixing: + various hanging signs: office signs, bus signs, advertising posters + RV interior: fixing LIGHT ITEMS + IN THE KITCHEN OR BATHROOM: As a towel holder, install a soap dish in the shower. Your advantages at a glance: Versatile. Incomparable clothing Very