Hougen 14009 Arbor (3/8" Chuck) for Quad-Lead Threaded Cutters includes pilot & hex washer 75002.5PR this case is the replacement

this case is the replacement

annular cutters

It features a 5/8" bayonet style twist lock shank for fast change out without requirement of any other tools to install in the drill arbor

Hougen 02496 Rubber Collet fits 1/4"  - 1/2" Taps - For Tapmatic

Hougen 14009 Arbor (3/8" Chuck) for Quad-Lead Threaded Cutters includes pilot & hex washer 75002.5PR this case is the replacementHolcutters 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