This 6mm collet type adapter for the Jetfan-120 ECO was especially designed!
You can use this 6mm collet type adapter for assembling a Heli-type outrunner motor with an 6mm axle even with a big flat spot.
Therefore we do have 2 segment only to make sure that the flat spot will be completely covered by on segment.
Attention: Here we are selling the 6mm version only, the shown 8mm type is just for reference!