[sdiy] What is the name of this tool?

[Louis van Dompselaar]

That sounds like the one I have that I called 'stepless' for want of a better word
http://www.dompselaar.org/drill.jpg

> Further to everyone else's answers I submit something slightly 
> different. The Conecut.
> 
> Sold by Rapid, Farnell and others, this one is a cone shaped drill with 
> two cutting edges. Its a bit like a reamer but for power tools.
> 
> Price is around 15GBP
> 
> Tony
> 
> www.oakleysound.com
>