This WILL NOT work with the reefs 99 micro servo as stated in the review above. Although it is 25 spline, it is standard 25 spline. The 99 servo is micro 25 spline, therefore the servo saver portion would just free spin on the servo. I bought this after reading the above (false) review, just to realize I wasted $7 when the part arrived and didn't fit.
The Axial AX31009 servo saver set comes with 23,24 & 25t standard shaft spline adapters and will not work with micro servos such as the Reefs 99 micro servo even though it has a 25t spline as the shaft diameter is smaller.
Full size and mini servos can have the same shaft diameter but micro servos are smaller.
There are three pivot post parts included in this package that are identical to the pivot post included with the Spektrum SX107 Micro Servo commonly used to operate the DIG unit on the Axial Capra crawler. Having one of these posts from this package allows one to use any suitable aftermarket micro servo on you Capra. My choice was a Reefs 99 Micro Servo which has about 2-3 times the power of the Spektrum unit. Works like a charm.