Non-coring diamond bits are solid, full-hole drilling tools designed to completely grind away material rather than leaving a central stone plug behind. They are highly favored by stone fabricators and contractors for drilling small-diameter anchor holes, blind holes, or pilot holes in hard, dense surfaces like granite, quartz, quartzite, porcelain, and Dekton. Because they grind down the entire hole surface, they eliminate the frustrating step of having to punch out or snap off a stubborn core slug