roadkill Posted September 3, 2014 Report Share Posted September 3, 2014 Got some m12 200mm thunderbolts that I need to screw some fence posts into a brick wall. What size drill bit will I need to use? Cheers jamie Quote Link to comment Share on other sites More sharing options...
ph5172 Posted September 3, 2014 Report Share Posted September 3, 2014 12mm drill diameter Quote Link to comment Share on other sites More sharing options...
millrace Posted September 3, 2014 Report Share Posted September 3, 2014 Depends....some types take size down ie 10 mm....... Quote Link to comment Share on other sites More sharing options...
bucksshooter Posted September 4, 2014 Report Share Posted September 4, 2014 try 10mm first but 12mm should be fine depending on the hardness of the bricks. Quote Link to comment Share on other sites More sharing options...
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