SUITABLE FOR AUDI,ALFA ROMEO, BMW,MERCEDES BENZ, MAZDA,MG,MITISUBISHI, SKODA,NISSAN,SUZUKI,PEUGEOT, HONDA,CITROEN,VAUXHALL,TOYOTA,FORD,FIAT,JAGUAR,VOLVO Header Diameter:13MM, Collar Diameter: 20mm, Fitting Diameter: 7-8MM