The Rear Left Brake Caliper for Ford F-450 550 Super Duty 2017 2018 2020 with Bracket is a durable iron caliper with a piston diameter of 2.53 inches. This direct replacement part comes with the necessary mounting bracket and features a 3/8-24 inlet port size and 3/8 bleeder port size. It is compatible with Ford vehicles and comes with a limited lifetime manufacturer warranty. The caliper includes two pistons, making it a reliable choice for maintaining proper brake function on the rear left side of the vehicle.