"I was having trouble drilling through 5 mm pre -heat treatment O1 tool steel. These cobalt bits get through it with no problem, using the correct speed and a cutting fluid. Good value on special offer."
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Review 3 for Erbauer HSS Cobalt Drill Bit Set 25 Pc
"I bought this set hoping that the case would keep the bits organised and secure. After only a couple of weeks use the bits became loose in their flimsy plastic clips and refused to stay in place making it a long and frustrating task to shut the case. Returned to branch to be told that warranty "wouldn't cover that kind of thing". The bits themselves are of only modest quality just about earning the 2 stars for performance and value because I bought them on a half price promotion. Best avoided."