Decent quality imperial drill bits.

[Alpha1]

I use Cromwell tools.

[ovenpaa]

I use Guhring cobalt drills for just about everything other than when Carbide is needed. They really are the only way to go.

[Alpha1]

Cobalt is good.

[ovenpaa]

Not as good as carbide however it has its place.

I have two metric Guhring drill sets in 0,5mm increments, one is 4 years old and one 18 months and none are missing or broken.

[Alpha1]

I find it difficult to keep a full set of any thing they just seem to be spirited away.