Safety Lock：Lock the knob to prevent objects from falling. When the hanging object is overweight and the internal spring breaks, the safety clip can lock the knob to prevent the hanging object from falling. High Quality：This hanging bracket is made of high-quality metal and plastic, strong, heavy-duty and durable. Wide Scope of Application: Retractable spring balancers are widely used in many fields, such as assembly lines, automobile manufacturing, factories, tools, fixtures and parts, etc. Practical and Effective: This is a very practical and effective spring balancer retractable tool hanger. It is designed to help secure tools in place for easy access and use. It can effectively reduce repeated work, improve work efficiency, and save time and energy. This spring balance can be used in many situations to meet the different needs, such as equipment fixed, part installation, material and tool hanging, and etc., Manufacturer: ROHCGHC