I have a few random (several actually) drill bits that are oddly shaped at the end.
what I noticed was that this brand of bit was real forgiving in allowing me to jump from a small to large bit and in some cases my large bits did not require a pilot hole.
The downside is you have to use these bits very cautiously because they break very very easy. This I am willing to live with in trade for good cutting and performance.
what I don't know is who made these bits.
they say this info on the shank
size
CO
USA
that's all they say
Who is "CO"?
CO could stand for cobalt?
I thought that as well.
Pictures sir. I have an entire index at work with some of the most badass bits on the market.
here you go