The Content Of The Article:

I bought a mirror (120 x 30) to hang on a partition of my apartment. This partition between two rooms is thin and when I pierce, behind it is hollow. Could you tell me which peg to buy for my purposes?

The description of the partition is probably a partition made of plasterboard.
To fix an object in this type of partition, it is necessary to use "Molly" type expansion plugs. The wall must first be drilled using a drill with a diameter corresponding to the diameter of the dowel, then introduce the dowel and expand with an expansion clamp. The hanging mirror can then be fixed on the screw delivered with the ankle. Another solution, if the mirror is not framed, is to glue it with a strong double-sided adhesive.

This may interest you

Video Instruction: How to Hang a Heavy Picture on a Plasterboard Wall Video#1