This pair of extension collars fits over the dual-pole adapters of our plasma display cart (UPD-...) and our plasma display floor stands (PSD-TS... and PSD-CS...). They allow you to extend the length of the poles by cutting the poles in half and then reattaching them using the PSD-EXT. This allows for easier transportation of poles as they are now half the length. Note: Do not extend any of our chrome poles beyond 84 in. high with these extension collars.