flute length

The drawback is a slightly smaller depth of cut compared to the equivalent router cutter, the flute length being typically 3 to 4 times the diameter.

E90- An end mill sharpener and grinder that sharpens end mills up to one inch in diameter and six inch flute length.

In contrast with other types of High Speed Machining toolpaths, VoluMill toolpaths are typically run at axial depths of cut up to the full flute length of the Milling cutter.

I use a spindle gouge, sometimes an old bowl gouge at least I think it's a bowl gouge it's got a flute length of about 1" left and the grind is anybody's guess, but I can just get in there with it and get results.