The Simagic motor shaft extension fits the Simagic Alpha, AlphaMini, and AlphaUltimate only. Mounts between the motor and the male side quick release to extend the reach of the wheel. Includes extender, screws, and wiring extension. Does not come with instructions. The end-user is responsible for installing the extender and wiring the connector without damage. Damage to the steering base caused by poor installation of the extender is not covered under warranty.