This item is used.  This is a working unit. Check it out. The Reliance 3rd arm for 7700, 7720 is a medical lab and caregiving furniture product designed to provide additional support and stability for medical professionals during procedures. Made by the trusted brand Reliance, this 3rd arm is compatible with specific models and is ideal for use in healthcare, lab, and dental settings. It offers enhanced ergonomic support and precision for those performing medical tasks, ultimately improving efficiency and accuracy in medical applications. Please see attached photos.  What you see in the photos is what you will receive.