Consists of two central plates and two lateral mobile plates, hydraulically operated, sliding on two chromed telescopic cylindrical guides. The smoothing plates are made of wear resisting in deformable steel and heated by four gas propane burners.

The adjustment of the laying mat thickness is controlled by special devices so as to allow easy modification of shapes (VA W M) with angles of +4.5% and - 2.5% according to the job requirements. Other adjustment allow tamper travel position to be corrected due to wear. During work operations, when the machine stops (for asphalt supply, etc.) the pistons which lift the screed automatically block, so to avoid making prints on the mat.