The WILWOOD Caliper Dynalite 0.810in Rotor 4 Piston Black brake disc rotor is designed for maximum rotor diameter of 13.06 inches and maximum rotor thickness of 0.830 inches. It features a powder coat finish, lug mount mounting style, and 4 bleeder quantity. The caliper has a piston A diameter of 1.750 inches and a piston quantity of 4. Made of aluminum, this brake disc rotor is suitable for both front and rear applications, with a white logo design and Wilwood branding. It also includes a side inlet and comes with a bleeder included.