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DRILL-TWIST 7/16"DIA X 1/4"SHK
Only a thin area of material touches the outside of the hole which provides for less friction and a better hole finish
PILOT-15/16 DIA COUNTERSINK
They require less horsepower and thrust to cut
The Hougen split point quickly starts the hole and the double angled flutes increase penetration speed
Hougen 14276 2-9/16" Hougen Sheet Metal Holcutter Hougen Parts DRILL-TWIST 7/16"DIA X 1/4"SHKHolcutters are not hole saws. They're precision ground, heat treated tools that easily cut thru the stock rather than ripping, tearing, and pushing thru as do typical hole saws. They can produce holes three times faster and cleaner than hole saws in sheet metal and have dramatically extended tool life, too. All sizes have a "shoulder" to prevent plunge thru, which is especially useful when drilling into live electrical boxes. See for yourself why
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