The assortment of special expansion screws proposed by Leone derives from over 30-year experience in manufacturing expansion screws. The screw selection ranges from the Pagani classical fan-type screw to the Bertoni three-directional ones to the kit for constructing 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 smooth, ensuring great sturdiness and good friction and preventing any unwanted turning back.
