This is a shaft adapter for Thrustmaster bases with detachable wheel rims. This adapter features a flatted 0.75 inch diameter aluminum shaft which is ready to accept a shaft coupler or U-joint to run an extended steering column shaft in a custom sim rig. This is ideal when remote mounting of the servo base is required. Can also be used in custom builds that require a more durable wheel mounting system than the OEM Thrustmaster can provide. These are surplus items and quantities are limited. This is strictly a do-it-yourself product and we cannot offer any support for it.