GM Genuine Parts Serpentine Belts are designed, engineered, and tested to rigorous standards, and are backed by General Motors. This belt 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. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).