It´s for eating pizza. But it´s used in prisons, for dangerous prisioners

Somebody put the pizza on that thing, and they chain the chain to a rope. Then, the prisioner pull the rope and take his pizza.

It has the "wall" at the biggest part to avoid the pizza falling during the pulling. And it has that kind of spikes to give it the looking of a pizza-mover for a bad person, in order to make the prisioner comfortable with his inner evil.

Sorry for the language.