Zimmermann Disc Brake Rotor - 600324020: Zimmermann Disc Brake Rotor - 600324020 is a high performance, direct replacement rotor designed for use in cars and light trucks. It is made from premium grade cast iron and is coated with a special rust-proof finish. It features a vented design for maximum cooling and a slotted surface for improved braking performance. It is a reliable and durable product that will provide years of reliable service.