I've also been using the bits from richon-tools and so far I've been able to drill atleast 6 holes for 1" bulkheads and atleast 12 for 1/2". I keep thinking that this is the last hole for this bit but they just keep on going. I'm very happy with the bits and the cost, cannot beat it anywhere. Also as far as breaking tanks while drilling I have drilled through 3 of my own tanks varying is size from 50G to 10g and have never had even a close call.
Rich
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