<http://schema.org/description>
"&lt;p&gt;The irregularity of a machined surface is the result of the machining process, including the choice of tool; feed and speed of the tool; machine geometry; and environmental conditions.  This irregularity consists of high and low spots machined into a surface by the tool bit or a grinding wheel. &lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/columns/surface-texture-from-ra-to-rz>