Each 47mm Adams suction cup has a weight loading of 3 pounds (1.36kgs).
This suction cup has a long neck with gripper nubs around it's circumference and can be used for a sign which is 3mm in thickness or for gripping inside a drilled hole of an object. If using a drilled hole, the 4 x 1mm nubs will ease back out to grip the back of the poster (see technical drawing image for dimensions).