Here's what Hercules say about the KS400B:
The HERCULES Z-Style Keyboard Stand KS400B has a built-in Auto Lock system for easy height adjustment and has a one-piece compact folding design.
- Auto Lock System with Auto Lock Lever adjusts height setting easily and is safe and secure.
- Locking Pins and adjustable moving arms for easy set up and tear down.
- The Adjustable Rubber Foot fine tunes height and levels the KS400B for maximum stability.