Hougen 14278 2-5/8" Hougen Sheet Metal Holcutter doc-50 8 - 20 mm X

8 - 20 mm X 1/4" depth in plastic tool case is perfect for twist drills and hole saws

11088 Arbor Assembly Center punch Extra Pilot (7) cutters - 8mm 10mm 12mm 14mm 16mm 18mm and 20mm

RotaMagic extends tool life and improves cutter performance

Kit includes cutters of size 1/4"

Four individual threads on the arbor allows the cutter to quickly be threaded on or off the arbor

Hougen 14278 2-5/8" Hougen Sheet Metal Holcutter doc-50 8 - 20 mm XHolcutters 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