u/j4red4j

https://preview.redd.it/0owfyxu24gbh1.png?width=1038&format=png&auto=webp&s=24cfc172d1b704acd84f7ef03604a3801161f155

Question about the Hikvision DS-1273ZJ-140-DM45 wall mount.
What is the purpose of this rectangular slot?
I've marked it with an arrow.
I can't find any reference to it in the documentation.

I have a Hikvision DS-1273ZJ-140-DM45 (Black) wall mount.

There is a small threaded hole in the side of the mount (see photo). A standard (probably M4) screw fits perfectly, but the mount didn't come with any screw for it.

https://preview.redd.it/4r6wyvrnc8bh1.jpg?width=1200&format=pjpg&auto=webp&s=4199e0025a1fdcf779f545aafbd5dfb4b8f562d9

Does anyone know what the purpose of this threaded hole is? Is it intended for a locking/set screw, grounding, or something else? Thanks!