This is a retractable spring balancer, model MCT-602-B, designed for assembly line use. Function: Suspends tools to reduce operator fatigue and improve handling by balancing the tool’s weight. Model: MCT-602-B Capacity: 0.5kg – 1.5kg Material: Made of iron with a steel wire rope for durability. Safety: Equipped with a safety device that locks the item if the weight exceeds the capacity or the spring breaks.