1. Crafted from great spring steel, featuring exceptional strength and toughness. It boasts high durability, excellent elasticity, and outstanding resistance to breakage. The surface with chemical blackening treatment, forming a dense oxide protective film that effectively prevents rust and extends service life.2. During installation, the spring can be directly inserted into the mounting position with the help of its built-in fixing wire for positioning. The fixing wire will automatically slide out once installation is complete, eliminating the need for extra steps, simplifying the process, and improving efficiency.3. Designed for equipment like drilling machines, enabling the sleeve to automatically return to the top after drilling.
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