A triple-fluted wood bit is a bit that has been designed for maximum wood boring efficiency.
It combines the flat cutting edges of spade bits…
…with the wide flighting and guide screws of auger bits…
…and the steep spiral flutes of brad point bits.
The result is a very aggressive cutting tool that bores through wood quickly but leaves an extremely rough finish.
Triple-fluted wood bits only work with power drills, and require a driver of upwards of 18 volts in order to work efficiently.
They are prone to causing tear out both on entry and exit from a borehole. This means they can rip off large splinters from the surface of the wood stock, ruining its appearance.
As such, this type of bit is best used for construction, or in situations where presentation isn’t a factor (you might not be able to see the wood) and you need to bore a large number of holes in a short space of time.