The Vita-Mix 891 Drive Socket Kit 12-Pin 1-3/4" OD transfer motor power to the blender blade assembly for consistent mixing performance in compatible commercial blenders. This replacement drive socket kit features a 12-pin configuration and a 1-3/4-inch outside diameter, designed to connect the motor drive with the blending container's blade mechanism. It works by engaging with the bl... https://partsfe.com/drive-socket-for-vitamix-part-891