<http://schema.org/description>
"&lt;p&gt;A dual-carbide-grade drill has a micro-grain carbide core blended to provide toughness to prevent chipping at the drill's point. Surrounding the core is a second carbide grade that provides hardness needed for wear resistance at the drill's outer edges.&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/articles/dual-carbide-technology-addresses-basic-drilling-challenge>