Product details:
Holcutters by Hougen are not hole saws. They're precision ground, heat treated tools that easily cut thru stock without ripping, tearing, and pushing like typical hole saws. Holcutters produce holes three times faster and cleaner than hole saws in sheet metal and have dramatically extended tool life. All sizes have a shoulder to prevent plunge-thru, which is especially useful when drilling into live electrical boxes. For materials up to 1/8 inch thick. A single arbor (p/n 14009) is used for all sizes and is required for use unless using the optional speed reducer.
