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#4
09-23-2011, 02:46 AM
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Industry standard is half diam. of hole from edge unless tempered. But for external pumps I usually go 2"+ from edge.
And FYI a tube bit with graphite will produce a much cleaner hole then a diamond embedded bit but will be harder to find and requires a tripod to drill
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Hi, my name is Corey... And im a reefaholic. 
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