2-belt monoblock conveyor belt, automatically adjustable in width according to the dimensions of the workpiece. The opening-closing movements are carried out by means of 2 guide rails where the belts are sliding. The DONATONI KROSS is fitted with guiding rollers for properly aligning the workpiece to the belts. Each belt is equipped with a lateral band (such as backguard) allowing the workpiece to be held in position during processing. The movement along the width direction is given by a three-phase motor, and the workpieces are conveyed on a belt by means of a brushless motor.