Here's a photo of the last one I have, out of a bag that I think I bought for fixing SWA cable to the fence on the way to the shed, but I've found them useful for other things. Of course I no longer have the bag or other label, and I can't remember where I bought them.
The background is paper with 5 mm squares. The clips come with a hole that you can put a screw through.
Any idea what this is called or (even better) a link to where I can restock?
Thanks