Each Axis shaft has the "Hidden Insert Technology" (short HIT) and therefor you need a HIT-insert. Normally these shafts are already delivered with such! So be aware that you don't buy additional ones.

>  - X HIT conventional inserts included

From [Lancasterarchery][1]

You can get them for example [here][2]. 


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The Deep Six RPS Steel insert is also compatible but I would absolutely recommend the HIT inserts. 

>  - X HIT conventional thread inserts - compatible 
>  - Deep Six RPS steel inserts - compatible

From the official [Axis product site][3]

*P.S.: Axis absolutely rock! =)*

*"I shoot Axis because they're tough shafts, but more importantly, I shoot them for the increased penetration I get on big game."* - Fred Eichler

  [1]: http://www.lancasterarchery.com/easton-axis-n-fused-carbon-arrow-shaft.html
  [2]: http://www.3riversarchery.com/easton-axis-hit-insert-kit.html
  [3]: http://www.eastonhunting.com/products/arrows/axis