HIKVISION DS-2CD2412F-I Quick Operation Manual page 12

Network Camera·Quick Operation Guide
2. Stick the drilling template to the ceiling.
For cement ceiling mounting, you need to use the expansion

screw to fix the camera. The mounting hole of the expansion
pipe on the wall should align with the mounting hole of the
drilling template.
Figure 3-1 Open the Cover
Figure 3-2 Drilling Template
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