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 145 mm Diameter - Designed to fit in existing 197 mm (7”) round headlamp or 145 mm (5 3/4” Spot-light openings.) Material: High Density Polyethylene Brake Round Intake Duct - For connection to 63 mm ID flexible hose.