The Ergotron LX Pole Collar, part number 97-844, is a mounting accessory designed for specific Ergotron LX Sit-Stand Arms. This pole-mountable collar facilitates the attachment of a second arm to a desk-mount base, expanding workstation configuration options. It allows users to position an additional mounting arm at a desired height along the pole, providing flexibility in monitor or device placement. The collar features a lockable design to secure the arm's position. It is specifically intended for use with LX Sit-Stand Arms and is not compatible with standard LX arms. It is compatible with Ergotron Mounting Arms 45-360-026, 45-384-026, and 45-405-026.