On Tue, 25 Nov 2008 23:31:38 GMT, Harry Bloomfield
wrote:

Colin Wilson wrote :
The shape at the end of the drill bit itself is different - drills for
steel are sort of spiralled and ground to have a sharp edge at the
end, whereas a masonry bit has a spiral with a blob of metal at the
end that takes the strain of the hammering.

Not the best of pictures, but...

www.lsdinc.com/images/products/masonry_bit.jpg

The masonry types have a separate tip brazed in, the tip looks a little
like a spear.

zulus, thousands of em.


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