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what to use to drill through porcelain tiles?

i need to drill 6mm or 7mm holes through porcelain
tiles, can anyone recommend suitable drill bits that
will both do job and not too expensive
smigger, November 2010
None of the product mentioned will even come close. If your porcelain tile is grade 3,4 or 5 you will need this
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=260690071601&ssPageName=STRK:MESE:IT
Follow the instructions on this page and you will be fine.
www.toolvolt.co.uk

Joe, November 2010
http://www.amazon.co.uk/Silverline-217584-Piece-Glass-Drill/dp/B000LFY56O/ref=sr_1_1?ie=UTF8&qid=1289235524&sr=8-1

Peccavi, November 2010
Use a masonery drill bit,put masking tape where you are going to drill, mark the hole and drill on very very slow speed DO NOT have the hammer action on,once you are through the glaze you can speed up a bit.

anon, November 2010