The 8051-408 Stand plate is designed to work with the Iso-Pod 8X50 and 8351 Monitors. They interface with the Iso-Pod that comes with all 8000 series monitors (all items sold separately) to allow stand mounting. The Iso-Pod allows you to tilt the monitor for optimal alignment. Simply mount the 8051-408 stand plate onto the 3/8" thread on the stand tube and ensure a tight screw connection. Place the Iso-Pod over the four pins of the stand plate and mount the monitor.