Surface smoothness The rod has a defect, round, and smooth exterior with no sand holes or black spots, ensuring easy handling and reduced wear during use. Uniform pitch Made from quality raw materials with quality. The tension spring is tight, the texture is clear, and the force is evenly distributed, delivering stable and predictable rebound. Good stretchability plasticity with strong fatigue resistance and uniform stress. The structure remains firm under load, with no surface defects, refined details, and a texture. Applications and use cases Precision machinery and equipment assemblies that require a smooth, reliable rod and consistent spring action. Automotive and industrial components where stable rebound and uniform force are critical for safety and performance. DIY projects or repairs that need durable, fatigueresistant springs and rods for longlasting operation. Key attributes Function: smooth, defect surface; reliable tension spring performance; strong fatigue resistance Material: quality raw materials with quality Performance: uniform force distribution, stable rebound, and durable, wellfinished surface Quality indicators: defect surface, refined texture, and consistent pitch Designed for reliability and long service life in applications requiring smooth, dependable spring and rod components.