Genuine OEM Porsche Feather Key, part number 90011707300. This feather key is a mechanical component used to connect a rotating shaft to a hub, such as a pulley or gear. It fits into corresponding keyways on both the shaft and the hub, transmitting torque and preventing slippage. The rectangular cross-section ensures a positive mechanical lock. Genuine OEM feather keys are made from hardened steel to withstand high torque loads in engine applications.