Compatible with LX Arms: Upgrade your LX Desk Arm (45-490-216), LX Wall Arm (45-243-216) or LX Keyboard Arm (45-246-026) with a second extension to increase its reach an additional 9 inches; adding extension may reduce weight capacity; not recommended for use with LX Dual Arms Simple installation: Easily and quickly add one extension to an existing LX Arm; includes 9-inch extension and end cap Extra flexibility: Another pivot point allows for a wide range of adjustment, expanding use for a broader variety of individuals and applications Neat workspace: Streamlined design accentuates any work area and clean cable management routes cables under the arm and out of the way Built to last: Extensive quality testing ensures your display stays stable and secure; Ergotron products set the standard for quality with a 10-year warranty and expert technical support