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Ian Stirling

wrote:
f its only for a few holes then buy a cheap hss set (drills).
Use a masonary 1st to go as big as you can... even starting small and
going up (make sure not to use hammer action). The once you dont have a
masonary just go up in 1mm increments with the hss bits- it'll only
take a few minutes to get to 16mm. I tend to do this job after laying
the tiles but before grouting, leaving a few days for the adhesive to
set. Alternatively, go to a hire shop and hire a bit- you'll only pay
for the wear on it.

Alternatively, diamond core drills are really inexpensive on ebay.
I got one 38mm diamond core drill for 14.99, and it's done 100 holes in
sandstone/brick so far.
(not from ebay, from http://www.machinemart.co.uk/