Got what I paid for

I purchased some drill bits from Ebay, very cheap ones, but it said that they were cobalt so I thought I’d give them a try for 2 and a bit quid.

After drilling about 6 rivets each they were in this state.
The rivets are only steel

In fairness the drills did have HSS stamped on them, but I suspect that stands for “Highly Soft Steel” in this instance, they’re almost certainly made from Chinesium. In future I’ll pay reasonable money to a reputable shop for decent drill bits. Lesson learned.