Fly Cutter tool, used primarily on a milling machine for machining large, flat surface areas. A fly cutter , composed of a body into which one or two tool bits are inserted. As the entire unit rotates, the tool bits take broad, shallow facing cuts.
Counterbalanced to get smoother finishes.
Uses inexpensive standard tool bits.
Moreover, Makes wider cuts than end mills.
As well as Faster speeds and better finishes.
Less chatter and free cutting on thin material or non rigid set ups.