You are buying two wall brackets for mounting two speakers to the wall.
BeoLab 3 wall brackets from STBbrackets are a faithful reproduction of the original bracket using original wall plates made by Bang & Olufsen.
Cables can enter from above, below or directly through the wall.
When Bang & Olufsen designed BeoLab 3, they allowed the speaker to rotate downwards if required when wall mounted. The tilt feature is compatible with this wall bracket and so this allows the best angle to be selected for a high installation position.