This Assenmacher Specialty Tools V 450 with 3/8" drive socket hole is a very useful and quick way to rewind or compress by turning the rear brake piston on some modern vehicles . It is made in the United States of high quality steel manufacture and should last use after use. This tool will work on the Mini Cooper Chassis', R50, R52, and R53 up through 2006. Also Volvo S40 and V50 series. The Saab 9-3. The Jaguar S-Type. The prongs are 0.750 " or 19 mm center to center. And the pins are 0.200 " or 5 mm  in diameter. You can also rely on these measurements for your application.