Keeping your brakes cool. Engineered for maximum air flow. - Performance Cooling Air Intake Brake Ducts - Ultimate cooling of brakes - Overall length 125 mm - Brake duct 150 x 75 mm Diameter - Designed to fit in 152 mm (6”) X 51 mm (2” ) openings. Material: High Density Polyethylene Brake Round Intake Duct - For connection to 63mm