7/8" Sheet Metal Holcutter Quad Lead 1/8" Doc 14228 GUNS-A6041 Mufflers do a great job

Mufflers do a great job of softening an exhaust note or obtaining a particular tone

stainless steel Bisalloy and wear plate

Visus 1/4"X24 Ns Hss Second Tap For producing precision threads by hand tapping

Shank diameter 3/8"

Plastic tool case contains 11088 Arbor Assembly

7/8" Sheet Metal Holcutter Quad Lead 1/8" Doc 14228 GUNS-A6041 Mufflers do a great jobThe Holcutters, 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 extend 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