2 flutes - 30° spiral
=0,75 x D=1,5 x D=2~3 x D=5 x D
3 flutes - 30° spiral
=1,5 x D=2~3 x D
1 flute - 30° spiral
=2~3 x D
2 flutes - 45° spiral - Alu/Titan
=2~3 x D
2 & 3 flutes - 45° spiral
=2~3 x D