Posted by ANON on Monday, May 19, 2008 at 11:12am.
http://dictionary.reference.com/browse/drill
http://www.design-technology.info/equipment/pillardrill/default.htm
http://www.technologystudent.com/equip1/macdrl1.htm
http://en.wikipedia.org/wiki/Countersink
http://en.wikipedia.org/wiki/Pilot_hole
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