Use this Estella 348PSMO40CLAS clutch assembly to replace a broken or missing component on your Estella spiral dough mixer. This clutch assembly is a direct replacement for the one that came with Estella SM40 spiral dough mixers. This clutch assembly will help keep your unit operating safely and efficiently. This part regulates and controls your mixer's speed, and it realizes the mixing speed's multi-gear switching through mechanical regulation, such as low, medium, and high speed. If you notice a problem with your unit's clutch assembly, use this replacement to restore the mixer to working order.