General description 200 pieces assortment of extension and compression springs made from galvanized steel, packaged in a convenient storage box. Technical specifications Material: Galvanized steel Compression springs sizes: -5.5x17.5, -5.5x38.0, -6.5x10.0, -7.0x12.5, -7.0x19.0, -9.0x35, -9.5x16, -9.5x19 mm Tension springs sizes: -4.0x79.5, -4.5x44.5, -5.0x20.5, -5.5x25.5, -6.5x22.0, -7.0x98.0, -7.0x51.0, -8.0x28.5, -8.0x31.5, -8.0x44.5, -8.5x36.5, -8.5x47 mm Usage Widely used for automotive tools and engines, medical devices, large equipment, electronics, and sensitive measuring instruments.