HOSCO original wooden neck support consists of 2 parts as pictured, which you can get two diff erent height at the neck rest. The top part is cork lined to protect the neck, and swinging on the bottom.
2-Way Neck Support
Other uses
You can support thin instruments such as Ukuleles with only the top part.
Note
H-NSG gives you a good stability not only fret leveling job direction, but also fret crowning job direction.