Features: Engineered for precise model compatibility, this motorcycle chain adjuster seamlessly fits CRF150F (2003 2017), XR250L (91 96), and TW200/TTR250 (1987+) without frame modifications, ensuring direct OEM bolt on installation for 428 chain systems. Features a threaded adjustment mechanism delivering ±0.1mm accuracy per half turn, paired with auto lock nut and R bushings to maintain 20 25N·m moment stability during off road vibrations, crafted from 6061 aerospace aluminum with anti erosion coating. Designed for motorcycle enthusiasts and off road riders requiring strong chain tension control, especially those replacing factory adjusters prone to loosening in hard terrains. in muddy , wet conditions, and high shaking environments, maintaining optimal 10 15mm chain slack while resisting deformation through 100+ adjustment cycles. Streamlines maintenance with tool easy calibration via marked rotation scales and lightweight design (380g), offering 3x longevity over plastic alternatives for effortless single person operate. Specifications: Component : aluminum alloy Size: about 10x15cm/3.93x5.9inch Package Includes: Pair Chain Adjuster note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.