wall anchor

I have this packet of anchors that I'd like to use for hanging a towel rail but the included screws are missing. The packet helpfully only says they are included. What kind should I buy to replace them?

I bought some Rhino Shelves a while ago for my bedroom for books. They are all level and built correctly but the seem to wobble. It was suggested to to me to buy some brackets to anchor them to the wall to stop this. I would need to drill holes in the shelves and then the concrete wall. Its...

I was affixing a wall anchor to a hollow plasterboard and the bolt inside rounded because it was defective (it round two more bolts). So I removed it and of course damaged the gypsum. Can you advise on how I can fix this to attach a new wall anchor? John **picture of wall anchor and hole attached.