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Hard Coral
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08-31-2017, 01:38 AM
Tyfighter
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Join Date: Nov 2015
Location: Vancouver, BC
Posts: 94
A concrete bit will drill through it if you have it on have it on the hammer setting. If you don't want to risk cracking it you would want to use a diamond bit as stated above. What type of coral are you drilling and what size is the hole?
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