Friction disc (friction disc with diamond coating) for fitting between the belt pulley and crankshaft for all 1.8T and 2.0 TFSI VW / Audi engines. Micro-movements occur at high torques at the crankshaft pulley screw connection. Even when using ARP screws , the connection is not 100% free of play. This can lead to a fatal defect in the pulley after a certain time. In the worst case scenario, the guide groove shears off, resulting in major engine damage! The friction disc increases friction by up to 300% and thus ensures a better bolted connection. As the disc is only very thin (0.1 mm), there are no problems with the timing belt drive. A must for engines with a lot of power! Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com