The Centric Parts Semi-Loaded Brake Caliper is the perfect choice for your brake system. This caliper is precision machined and assembled with all new components, and is pressure tested for optimal performance. The bore size is 63.5 millimeters, and the bleeder thread diameter is 7/16"-24. The caliper is inspected to ensure proper operation and fitment, and is finished with a gray painted finish for corrosion resistance. With this caliper, you can be sure that your brakes will be reliable and perform at their best. FleetPride is your First Click in Heavy Duty®.