Monolithic support structure, configured with in line fixed double bridge geometry and lower mobile pallet.

On the front are mounted no.2 boring heads on a sliding carriage assembly that can be manually adjusted horizontally. In the part after the bridge are mounted no.2 heads or profile inserter groups, fixed on a sliding foot

adjustable manually with orthogonal adjustment and parallel to advancement, and finally the pallet carries the fixed flange consisting of a crawler handling system, and one adjustable in the left specular part. All adjustments

are performed manually by means of handwheels. The sliding systems are on a high-precision guide and shoe, the boring heads are tube electro-pneumatic drive with a stop and speed adjustment hydraulic brake.