Looking for panel inserts

Hey guys,
I’m looking for some inserts to reinforce drilled holes in thin -about 1mm thick-
panels.
I have seen them in finished products but can’t find them anywhere.
I think they are either a rivet like washer which is sort of pressed in position to stay put or some sort of stepped washer which is bonded in place.
I would prefer to find a supplier in europe.
Anyone knows where to find them? Thanks

Rivet nuts work good.

Click Bond