These are reinforced screws between engine head and monoblock. They are produced with lathe at the CNC (12X1,25mm). The lock washers are 4mm (thick) and they are produced with laser cutting.
Viti rinforzate tra testa e monobloco 12X1,25mm realizzate al tornio controllo numerico. Le rondelle hanno uno spessore di 4mm e sono realizzate con taglio laser.