<http://schema.org/description>
"&lt;p&gt;There are times when you want to circle mill the holes on a bolt pattern.  Possibly you want to rough the holes prior to finish boring. &lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/columns/circle-milling-a-bolt-hole-pattern>