Cobalt Alloy HSSE Left Hand Spiral Drill Bit Set 3mm to 7mm

They do what they should.

The bits are dulled from the pack, just about made it through a broken bolt which was the reason they were bought. The 4mm and 5mm were blunt and the 6mm was OK, removing the remaining thread. Fingers crossed a sharpen helps.

Only bought them to do one job (the 5mm drill was only one used). I hoped it would remove the broken brake disc retaining screw from the wheel hub, as left handed drills sometimes do, but it did not. What it did do was drill all the way through the screw without any damage to the drill bit, I was then able to fit my stud extractor which removed the bolt. I bought these drill bits thinking they were a cheap price and might do one job per drill but on the evidence of one hole I am very happy with them (or at least the one I used). I may change the review to 5 stars after more use.

Only used them once to remove broken lug nut which they removed with ease it will be interesting to see how they preform on something a little more challenging but that said they done the job on this occasion.

Got through the bolt I was drilling out but the Smallest drill bit and the biggest drill bit in the set both broke!

The 3mm, 4mm, 5mm are as blunt as hell. The only ones any good are the 6mm & 7mm. Will be requesting a return for refund.

Not top of the range but suitable for purpose