Extremely strong grip: our special manufacturing process allows our suction cups with knurled nut to hold firmly and lastingly on smooth surfaces such as tiles, windows and walls or outdoors or in the bathroom/ Easy to mount: no drilling, no screws, just clean the bracket, press down and secure with a knurled nut. Product details: 20 large suction cups. The actual suction cup size is 40mm. Each cup can hold up to 2 kg. Versatile: our suction cups can be vacuumed on all smooth surfaces such as windows and glass, ceramic tiles, plastic, Formica, etc. Pack of 20 suction cups with 40 mm M4 thread - Transparent suction knobs with knurled nut. Thanks to the vacuum effect, they have great suction power and suitable for fixings of: + hanging signs of all kinds: office signs, bus signs, advertising posters + in the motorhome: for attaching light objects + in the kitchen or bathroom: as a towel rail, for attaching a soap in the shower cubicle. Your advantages at a glance: Extremely versatile. Incomparable hold Very high absorption capacity. Quick assembly and easy. Quantity delivered: 20 pieces