Technical Specs Product Name Spring Balancer Material Steel Construction Load Capacity 5-9kg (11-19lbs) Design The operator can adjust the spring tightness and the height Usage Used for hanging tools and other objects Package 2 Pack Description High Quality Heavy duty steel construction, strong and sturdy, not easy to deform. And the surface is powder-coated, which is anti-corrosion and rust resistance. Loud Capacity With ropes made of aviation professional steel, this tool can bear a weight of 5-9kg (11-19lbs). An anti-collision buffer rubber sleeve is also provided to reduce the buffering force. Application Mainly used in factories, car maintenance, workshops and other industrial fields, used for hanging tools and other objects.