The Chief PSB-2136 is a required interface bracket when mounting large flat panel displays onto the custom versions of the:
CM2C40 Automated Flat Panel Ceiling Lift
PFC2000B Flat Panel 4 - 6' Mobile Cart
PF12000B Flat Panel 4 - 7' Floor Stand
PPC2000 Presenters Cart
PIWRF2000B In-Wall Swing Arm Mount
PST16 Flat Panel Portrait/Landscape Fixed Wall Mount