Sony SU-W210 Manuel D'instructions page 8

Step 6: Attach brackets C, D, and E to the TV
To prevent damaging the surface of the rear cover of the TV, put a soft mat on
the rear cover.
Attach bracket C of the desired angle to bracket B.
1
Insert the hooked part of bracket C into bracket B as illustrated below.
Confirm that both sides of bracket C are outside bracket B, and secure
them firmly with two of the supplied screws.
There are three types of bracket C, each with a different angle: 0°, 5°,
and 10°. Choose the bracket C with the desired angle to attach.
The illustration below shows an example of how to attach bracket C
with an angle of 0°.
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Downloaded from:
Bracket C
https://www.usersmanualguide.com/
The angle "0°," "5°," or
"10°" is marked on the
side of bracket C.