Premium 6061 aluminum construction provides lightweight durability and consistent action, making this adjustable idler pulley set ideal for K24 engine upgrades. High precisions manufacturing ensures proper fitment and enhanced engine efficiency, specifically engineered for compatible and civil models. Concentrated finish proposals superior oxidation resistance and sleek silver appearance to withstand harsh conditions for long lasting use. Adjustable configuration allows manual belt tension modification to optimize engine function and efficiency in various driving conditions. Package includes: Tensioner set