HIKVISION DS-KD8003-IME1 User Manual page 56

Video Intercom Module Door Station·User Manual
Figure 4-49 Cave the Installation Hole
3. Paste two Sticker 1 inside the installation hole. The gap between two stickers should
be 17 mm. Chisel screw holes according to the stickers.
The suggested size of hole is 6 (diameter) × 25 (depth) mm.