Well there's no such thing as a 120mm drill bit. What you have to do is drill a small hole and then use a jigsaw, or just use a dremel. If you want a perfect hole you can use a router.
Well there's such thing as a "holesaw" that can be thought of as a drill bit. You attach it to any ordinary power drill and have an arbor (drillbit that serves as an anchor) in the middle of the circle.
gentleman,
if you want a kit, gasket,fan,grill,holesaw
or one of any of those components drop me a line
the 120 holesaw(with arbor or without)i can get
at a KILLA price,
killa
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