This hookah screen is for use with ceramic tobacco hookah bowls. It sits on top of the bowl, between the shisha and the charcoal.
The advantage of using a screen instead of hookah foil is that the screen is reusable, it is easier to move to check the shisha, and it is thicker than foil which helps keep the charcoal from burning your shisha.
It is important to note that you should only use hookah screens and/or hookah foil on your hookah. Household foil typically contains binding agents that are released when the charcoal heats to foil to high temperatures.