Surface smoothness: The rod features a round, smooth exterior with no sand holes or black spots, reducing snagging and wear during operation. Uniform pitch and spring performance: Made from quality raw materials with quality. The tension spring is tight and consistent; the texture is clear; forces are evenly distributed; rebound remains stable for reliable operation. stretchability and durability: plasticity and good fatigue strength allow uniform stress and a firmer overall feel. The surface remains of defects (no sand holes or black spots) and maintains exquisite details and texture. Applications and use scenarios: Precision machinery and automation assemblies where a smooth exterior and reliable spring action reduce wear and extend service life. Springloaded mechanisms, clamps, and handheld tools that require stable rebound and even force distribution. DIY projects and maintenance tasks that demand durable performance, uniform stress, and longlasting material behavior.