Dowels are chosen according to the material and density of the structure in which they will be implemented, as the most effective method of fixing will not always be the same. The weight and size of the object to be attached to the wall must also be taken into account. They all have a similar function, but fit in different ways.
Expansion
These dowels expand as torque is exerted on them. They are often used in dense structures, such as concrete walls. They are the most load-bearing and weight-resistant, as they allow them to fit in firmer places. If you need to install a heavy shelf or table to a solid wall, you will need these.
Adaptable
These are dowels that contort when a screw is screwed into them, exerting pressure from the other side of the wall. These anchors are used in thin walls, such as those made of hollow brick, PVC, plaster or wood. They are preferable for mounting objects of more modest weights, such as mirrors or small shelves to flimsy walls.
Universal
They implement similar mechanisms to those found in expansion sockets and adaptable sockets. If they do not have sufficient space, their widening will tighten them to the hole, and if they do, they will contort to apply pressure. They are ideal for use in locations that implement different types of walls.
Wood
Wooden dowels, although useful, are not as mechanically strong as their steel or plastic counterparts. They are small wooden cylinders that are inserted into the wall, into which nails or screws can be installed. They can be installed in cement or solid concrete walls.