but if rotate direction of motor shaft is CW&CCW,and, heavy shaft loading, rapid running speed with low pulse ,rather not to use slot shaft type,

Unless small shaft load, high pulse, slow turning motor speed, a hollow shaft with slot is recommended.

If you are interested in above hollow shaft with Slot, you could download catalogue KC76 by yourself,

or you could get in touch with us, more pictures and catalgoues could be provided for you.