Replacement telescoping arms for mmRNA appliances. 9mm is the standard size used during fabrication. This unique hardware allows the clinician to advance the mandible in .25mm increments (up to 5mm) by making one full turn of the protrusion nut into the hardware. An end stop in the guiding sleeve prevents the rod and tube from disengaging. Improved design helps maintain the proper mandibular positioning. *Replacement for lost or damaged arms only! If acrylic has failed on the appliance, it will need to be repaired by the laboratory that fabricated the appliance. Please email RX@vivoslife.com for more information.