On May 2, 12:25*pm, Bob Engelhardt wrote:
http://home.comcast.net/~bobengelhar...rill2.jpg(43kB)

I found this bit at the dump. *It has a tapered shank & is marked "star
- hammer - twist". *It has a chisel point, not a cutting lip, so it
clearly does impact cutting & hence (?) is for masonry. *But it is not
carbide tipped! *It has some rust, so it can't be solid carbide, can it?

So, I guess the question is: is there some steel alloy that is used for
* masonry impact drilling?

Thanks,
Bob

S7?
Maybe the bit is for drilling pavement.