Raise the bar. If youre using a fixed height rack mount for your drums percussion or electronics why not add a Gibraltar CS Height Adjustable Rack Extension Pack and instantly increase your set-ups flexibility? Get the perfect height setting every time thanks to the inner tubes height notch markings which also allow you to quickly ensure your crossbar is level. Installation is a breeze with the RMAA tube joint end clamp which fits onto any standard 1 1/2" fixed downtube. Then simply insert the extra 1 1/4" inner downtube for a full 15 inches of extendable height. Please note: kit covers one pole only. Two kits required for a two-upright assembly.