<https://dtvsprings.com/product/compression-spring-224/#product>
<http://schema.org/description>
"Wire diameter: 0.5\r\nDiameter outside: 3\r\nFree length: 8.7\r\nWindings: 10.5\r\nColor: -\r\nMaterial: RVS\r\nGround: Yes\r\nSquared: Yes\r\nWinding direction: -\r\nLn / sn (mm): 6.5\r\nFn (mm): 11.5\r\n\r\nDTV Nr: 282123"
<https://dtvsprings.com/product/compression-spring-224/>