GM Genuine Parts Windshield Wiper Arms are designed, engineered, and tested to rigorous standards, and are backed by General Motors. A wiper arms are metal, pivoting at one end and with a long rubber blade attached to the other. This arm pivots on wiper linkage rods that are attached to a motor, pushing water or other precipitation from the surface. 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).