Can someone tell me what these are?

The real answer, Take the bumper to your chromer, they will weld the holes closed and straighten it for the price they give you, It is part of the service at my chromer. If they wont, find a new place to do your chrome. IMO. And RRR can be a little corrosive, but he has a wealth of knowledge to impart. Cut him a little slack, or not!