When I first used one of these types of cutters I drilled a lot of holes with my jet drill and these things just can't get any better, I cool through the center with antifreeze and they don't get any better hot. Hole 1 1/2" in 1/2 AR50 plate in less than 60 seconds.
Enhanced Cutting Efficiency with Olson FB23370DB 0 025 2 Inch Blade
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