"Security" bolts? For light bars etc? Suggestions?

[lhurley]

I welded a round head bolt to the brackets on my light bar and also used nylock nuts. The bolts are annoyingly long (couldn't be bothered cutting them down) so you need to use long sockets. They also go down into the bull bar so nice awkward place to get at.

Not so much anti theft just a massive pain to get out and stop opportunistic thieves.