Titan USA Micro End Mills, offered in stub or regular flute styles, featuring a 4 flute design, a ball profile, and a 30° hel . . . 4 Flute-Corner Radius-30° Helix-Stub & Regular Flute Stub or regular flute style Micro End Mills with 4 flutes, a corner radius profile for increased edge strength, and a 30° hel . . .