It is a sort of metal tray with thick edges on which the glass pieces are put when they are finished and ready to be tempered. As the "farazza" fills up, the first pieces are pushed forward by the new ones toward a less warm area.
The procedure goes on until when the pieces exit from the tempering oven. Nowadays the tempering procedure takes place differently, through a conveyor belt with an adjustable speed decided according to the thickness of the glass.

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