I have such a toothed bit, I think it was called a drill saw. It wants to "walk" strongly because of the rotational direction of the tool. It is also, in my paranoid opinion, very dangerous because there are teeth all along the shank. You can carefully touch a spinning drill bit but not this puppy. I used it once to make a 1/4 inch slot in some aluminum angle and did it with a drill press and a jig that held the angle from moving sideways and only let me move it the direction I wanted it to go. It worked but wasn't all that fast and made a heck of a racket.
I don't reccommend such a tool for this job, too hard to control and too darned dangerous to little blind haptors. Tom Fowle
