Need Hex key for Defender cameras

[dk1000 0]

Hi, I lost the hex key/allen wrench to adjust the angle of the cameras. I have a 21021 system from Home Depot with DVR and cameras. I believe the cameras may be 600TVL cameras but not absolutely sure. Where can I get another allen wrench? Not sure if this was a proprietary wrench or the special security type or not. Thanks much.

[dk1000 0]

I found a 4mm key works in case anyone else needs this info.