Orthodontic expansion screw made of stainless steel with wide, skeletonized holder and cross holes for optimal acrylic retention. Designed for transverse expansion and distalization of upper and lower jaw with maximum expansion of 7.5mm (4 x 1/4 turns = 0.80mm per activation). Features travel limitation mechanism, luminous yellow plastic direction arrow, and includes expansion screwdriver (straight, small standard). Package contains 10 pieces.
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