The ability to overlap is one of the main pluses, if you are drilling
for a through mortise the flat bottomed bit is no help but being able to
overlap is. They do give nice clean holes too though.
School of Life Sciences, University of Dundee, Scotland
email@example.com (timegoesby) wrote in message
If you drill a through hole (e.g. for passing a cable through a joist)
you don't get the ragged edges where a flat bit would break through.
That way it's easier to draw cables BOTH ways through the hole.
Problem with the screwfux ones is that they're so badly ground that at
least one in each set will only burn a hole and not cut one. And
they're near impossible to sharpen. Best get them individually from
the likes of Axminster; they ain't expensive.
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