<http://schema.org/description>
"&lt;p&gt;Machining internal threads in difficult materials is challenging, especially when hole diameters are small. Thread milling offers advantages for these applications that are important to consider.&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/articles/thread-milling-on-a-tiny-scale>