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They are precision ground, heat treated tools made from M2 HSS that easily cut through the stock rather than ripping, tearing, and pushing through as do typical hole saws
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They can produce holes 3 times faster and cleaner than hole saws in sheet metal and have a dramatically extend tool life
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There's no dead zone, so less thrust is required and no deforming of stock or jagged edges occurs.
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Multiple cutting teeth, precision ground which allows for a long tool life.
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Cutters make clean, burr-free, round holes with no deforming of stock or damage to the surrounding material.