The distance can be adjusted to 11cm, and the length can be adjusted by reducing the nut.

Highlight description:
[Stable & Durable] Bed frame anti-shake tool is made of premium plastic and metal material, stable and durable, rust and corrosion resistant, not easy to break, and can be used for a long time. 

[Upgraded Design] Headboard stopper fixer has upgrade in appearance and function, which are more beautiful, more silent and prevent shake more. It's more stable and durable to use and won't shake.

[Enjoy Silent Sleep] The bedside anti-shake support can keep the headboard stable and prevent shaking, ensuring your bed will never make annoying sounds when you sleep. You can enjoy silent sleep at night with our anti-shake tool. 

[Easy To Install] First, measure the distance between your rocking furniture and the wall, then choose the right size headboard stopper fixer by adjusting the screws. It is easy to install, practical and convenient

[Wide Application] Adjustable thread bed frame anti-shake tool is widely used for any furniture that is easy to shake, such as beds, sofas, bookcases, wine cabinets, decorative cabinets, etc.

Specification:
Product Name: Bed Frame Anti-Shake Tool
Material: plastic, metal 
Color: black, white (optional)
Middle screw size: thickness 1.6cm/0.63 inch, diameter 2.1cm/0.83 inch
Screw size: diameter 0.8cm/0.32 inch, length 1cm/0.39 inch
Double head size: diameter 4cm/1.58 inch, thickness 2.1cm/0.83 inch
Application: beds, sofas, bookcases, wine cabinets, etc

Parts List:
2x Bed Frame Anti-Shake Tool

Note:
1.Due to the difference between different monitors, the picture may not reflect the actual color of the item.
2.Please allow slight dimension difference due to different manual measurement. Thank you for your understanding.