The CRP Rack and Pinion Bellow - BKK0129 is a protective cover designed to fit over a vehicle's rack and pinion steering system. It is made of durable rubber material and is designed to prevent dirt, debris, and other contaminants from entering the steering system, which can cause damage and affect the vehicle's handling. The bellow is specifically designed for the BKK0129 model and is easy to install, providing reliable protection for the steering system.