porcelain insulator

No screws are supplied, as the type of screw depends on the material of the wall or ceiling (concrete, brick, plasterboard, wood).
You need a different type of screws depending on each material.

There are several ways to install pendant lamps. You can choose to install different kinds of lamps or several identical lamps. The fabric cables can be wired to a single electrical point or to several independent electrical points. If there is only one electrical point on the ceiling, but you still want to hang several pendant lamps, make sure you choose the right ceiling rose. For example, if you want to wire five lamps to one electrical point, choose a ceiling rose with at least five holes (see here), or a rose with a large opening that can accommodate several fabric cables.
You can find the complete collection of zangra ceiling roses here.
Wherever you want your pendant light to hang, you need to fix an insulator to the ceiling. An insulator is a kind of button with which you attach your cable to the ceiling. You can find several types of insulators on our page dedicated to Lighting Accessories.