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reverse osmosis
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02-26-2016, 05:36 PM
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porkchop
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Join Date: Sep 2010
Location: Nebraska
Posts: 382
All the hole saws I have come with a mandrel that has a pilot bit as it's center. You change the mandrels as the size changes. From 1" up they all use the same mandrel. Even a 6" hole saw has a 1/4" pilot bit
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