The suction cup can be pushed through a drilled hole (see technical drawing image for dimensions) and the nubs will spring back out to their original height to grip the back of the poster.
This strong suction cup has a long neck with protruding nubs around it's circumference. It is ideal for heavier posters 3m-4mm in thickness where a quick fixing is preferred to a clear screw or brass nut. Suction cups with nubs are also useful when fixing the neck into a solid drilled object.
Each 47mm Adams suction cup has a weight loading of 3 pounds (1.36kgs).