ACDelco GM Original Equipment Serpentine Belts are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These serpentine belts allows for the operation of various pulleys and drive belt accessories with the use of a single belt. The width and ribbed construction of the serpentine belt creates a secure point of contact with the pulley, which allows for traction. ACDelco GM Original Equipment parts are the true OE parts installed during the production or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.