<http://schema.org/description>
"&lt;p&gt;A design that combines a roller gear cam and Hirth mechanical-locking coupling allows this indexer to accurately position parts in 90-degree increments.&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/articles/cam-drive-allows-quick-accurate-90-degree-indexing>