GDP-GUHDO offers Xtreme Life™ proprietary carbide grade mortise compression and spiral bits. Currently available in popular select sizes, Xtreme Life bits outperform their “coated” counterparts in more ways than one, the company says. Unlike coated bits which lose their “edge” once they are sharpened, the Xtreme Life bits retain their performance through multiple regrinds. Xtreme Life bits are ideal for extremely abrasive materials, including white and black melamine.