The Genuine GM Crankshaft Gear 12556582 is a direct replacement sprocket made of steel, designed specifically for Chevrolet, GMC, Cadillac, Hummer, Buick, and Pontiac vehicles. This OE/OEM part is manufactured by GM Genuine Parts in Japan, ensuring quality and compatibility with your vehicle. The unfinished crankshaft gear is a genuine OEM product, providing a reliable and durable solution for your engine timing needs.