Is it possible to get steel nails in a glass bottle with a magnet.

Magnet and nails
It is convenient to use a magnet to pick up loose nails and other small steel parts from an open surface. They are attracted to the magnet in whole clusters. This happens because in a magnetic field the nails themselves become magnets and attract other nails.

In the case of the bottle, new factors emerge:

Direct contact between the magnet and the nails is not possible. The distance between the magnet and the nails will be equal to the wall thickness of the bottle.
The neck of the bottle has a small diameter and will be an additional obstacle.
A small but perceptible frictional force will act on the nails attracted to the wall of the bottle when moving upward.

Process simulation
The force of attraction of the nails by the magnet will sharply decrease due to the appearance of a gap between them. The nails will still collect in clumps and chains. And even if the magnet lifts such a lump to the neck, it will get stuck there. It is possible that the stronger the magnet turns out to be, the stronger the nails will be connected into a ball, and the less chances they will be of being pulled out.

Practical observations
Indeed, the lifting force of the magnet acting through the wall of the bottle drops sharply. The nails stick together in groups, but it is not possible to lift the group, because the strength of the magnet is not enough. There are cases when one or two nails separate from the lump and rise up, which are relatively easy to pull out of the bottle.

Output. Removing nails from a bottle with a magnet is possible, but very difficult. Pulling out at least a few nails at a time does not work the first time.