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CAR BRAND：Auto Timing Belt Idler pulley for OPEL ,Auto Timing Belt Idler pulley for BMW
SKF / INA：

Idler pulley is responsible for maintaining the proper tension on the timing belt to ensure accurate engine timing. 
Professional  auto timing belt kits idler pulley manufacturer - China SAILUNTE

Timing belt kit includes an idler pulley , which is an essential component of the engine's timing system.