The assortment of special expansion screws proposed by Leone derives from over 30 year experience in the manufacture of expansion
screws. The screw selection ranges from the Pagani classical fan-type screw, to the Bertoni three directional ones up to the kit for the
construction of the Twin Wing class II corrector.
The special purpose expansion screws are made of biomedical stainless steel with a mechanical tolerance superior to 1/100 mm.
The thread parts are absolutely smooth and they ensure great sturdiness, good friction and prevent from any unwanted turning back.