The classic Aston Martin DB cars used red fiber blocks to hold the fuel pipes to the chassis. These are often warped, cracked, and missing. These modern replacements are made out of a much more durable material that is colored to match the originals. The kit comes with 2 half blocks, the correct retaining plate, and a 2BA bolt and washer. This particular listing is the for the block that carries two 3/16" metal brake lines to the rear of the car.