Wagner BD126138E Premium E-Coated Brake Rotor, Front E-Shield coating prevents corrosion Smooth surface finish provides less pad break-in time Vapor Corrosion Inhibitor (VCI) bag reduces rotor prep & saves installation time More effective and safer stopping power due to increased surface area which improves heat dissipation Patented vane/rib design reduces rotor noise.Bolt Circle:4.33 inches