A pack of 2 x 47mm diameter Adams suction cups with nubs. This strong suction cup has a long neck with protruding nubs around it's circumference which is ideal for heavier posters up to 3mm-4mm in thickness where a quick fixing is preferred to a clear screw or brass nut.
The suction cup can be pushed through a drilled hole (see technical drawing image for dimensions) and the nubs will grip the back of the poster when the suction cup neck is pushed through.
Each 47mm diameter Adams suction cup has a weight loading of 3 pounds (1.36kgs).