HIKVISION DS-2TD2166 Quick Start Manual page 22

2. (Optional) If you want to route cables through the installation
surface, drill a cable hole according to the drill template.
Otherwise, skip the step if you route the cable via the side
opening.
3. (Optional) Fix the camera to the junction box.
1) Attach the drill template (supplied) to the place where you
want to fix the junction box, and then drill four holes in the
ceiling/wall according to the drill template.
2) (Optional) If you want to route cables through the
installation surface, drill a cable hole according to the drill
template. Otherwise, skip the step if you route the cable
via the side opening.
Drill Template (Type II Camera)