Broken bolt type thing on flat pack furniture

[sinizter]

This bit in the pic has broken.

The furniture was bought months ago. So can't return it, etc

Any idea where I can get a replacement?

It has H7 embossed on it. This is the bit that's placed into a pre cut hole and tightens around a bolt coming in from the side
http://instagr.am/p/PmrWXOE0nN/

Thanks

[sinizter]

Thanks for the very quick replies.

Cam lock it is ... 15mm diameter.