Product Description General use: furniture, appliances, mechanical automotive work, toys, marine, gate, screen doors and repair projects Model: Steel extension spring diameter 9mm(0.35 Inch) Length 50cm(20 Inch) Material: Steel; Zinc-plated finish Spring types: Extension Spring Spring length: 50cm Steel has good acid and corrosion resistance, good elasticity and stable performance Package Including: Extension spring x 2pcs