The Genuine GM Crankshaft Sprocket 55355345 is a direct replacement part made of steel, designed for specific make and models such as Buick, Chevrolet, and Cadillac vehicles from 2011 to 2021. It is a genuine OEM product manufactured by GM in Germany, featuring a zinc plated finish for durability. This sprocket is a crucial component for the engine's timing system, ensuring proper function and performance of the vehicle.