Selflocking design: Our spring balancer is specially designed for lifting, with builtin selflocking control system, precise control, high safety factor, special aviationgrade steel inside, precision manufacturing, flexible operation, can help you lift things easily, Save you more effort. Heavy Duty Construction: The shell of the spring balancer is made of aluminum material, which has high durability, stability and long service life. The shell is painted and has antirust function. Hotdip galvanized steel wire rope: The steel wire rope is made of highquality aviation steel, which has good toughness and fatigue resistance, and is very strong and durable. And the tool balancer adopts a rubber sleeve to safely protect the wire rope, reduce the buffer force and prolong the service life. Wire rope length 150cm rotating hook: Highstrength forged hook, not easy to fall off, rotatable; Highstrength safety hook with lock, safe and secure. WITH SAFETY DEVICE: This product can be used to manually lock the suspended object with a safety device. If the suspended object is overweight and the spiral spring is broken, can be locked immediately to prevent the suspended object from falling