For the treatment of Angle Class II cases (mandibular retrusion/distal occlusion) using double plates and simultaneous bilateral expansion of the upper jaw in growing children, using an expansion screw. Manufactured from the nickel-free MENAZNIUM® alloy with spring-hard strength (1,800–2,000 N/mm²); trace elements of nickel (0 to 0.05 %) may be present due to the manufacturing process.