This is a genuine OEM adjuster screw and wedges kit for adjusting the rear brakes on all minis. Part No: 17H7620. A screw with 4 flattened nose points is threaded into the backplate, as this screw is turned a pair of wedges are forced against the brake shoes expanding the shoes against the drum. Once the nose of the screw and the wedges get worn adjustment can become very difficult. This kit includes 2 wedges and a new screw suffcent for ONE brake back plate.