Extremely special screw for rapid palatal expansion. The anatomically designed shape minimizes space requirements in the palate. Pre-formed, laser welded retention arms, stable guiding pins and generously dimensioned threaded spindle for the greatest possible safety and force transmission. Screw is designed with anti-rotation mechanism. Comes with one regular key. Beveled hole entrance for easier key insertion. Size: 5 mm. Full turn: 0.9 mm. Maximum Expansion: 10 mm.