Hougen 14228 7/8" Hougen Sheet Metal Holcutter doc-4 They cut 3x faster and

They cut 3x faster and last 10x longer

The tapered inner diameter provides a relief area between the slug & cutter to reduce horsepower & improve slug ejection

1) Locate the holes center point

Only a thin area of material touches the outside of the hole which provides for less friction and a better hole finish

Max Hardness: 275 BHN / 28

Hougen 14228 7/8" Hougen Sheet Metal Holcutter doc-4 They cut 3x faster andHolcutters 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