Check the listing for details. On-Stage Stands Keyboard X Stand Add On Tier. Condition: New. Listed at 56.89 USD. The sturdy On-Stage Stands KSA7500 keyboard X-stand add-on 2nd tier lets you double your keyboard space without springing for another stand or a more elaborate system. Tilt adjustment helps you put your board right where you want it.It can be inserted into most X-style keyboard stands with round or square tubing, and uses a tightening knob with an internal-tubing mechanism to secure the 2nd tier. A midpoint clutch featuring two disks with 36 interlocking teeth allows the user to tilt the second tier to any position without worrying about slippage. The clutch is made with die-cast zinc for added strength.The unit comes complete with a stabilizer bar that keeps the left- and right-tier members upright when it is properly assembled between the two members.