From glass, delicate porcelain, tiles, to tough granite, our Diamond Core Drill Bits are trusted by artists, tradespeople, and hobbyists for flawless hole-cutting. Each bit is electroplated with 120# diamond grit for superior durability and precision. 33 sizes available from 3.5mm to 65mm Continuous slotted cutting rim for faster cutting, and a cleaner, more precise cut with minimal chipping Clearance hole on the side to prevent overheating, and to allow slurry and debris to escape, preventing any clogging Suitable for wet or dry drilling 3.5mm and 4mm are compatible with a Dremel Multi Chuck Best for Drilling: stone, tiles, glass, shell, fossils, bone, ceramic, concrete, Porcelain, granite, marble, glazed pottery, aquariums, and more... These diamond core drill bits are still our most popular tools for drilling through hard materials. Sometimes referred to as diamond hole saws or diamond coring drills, they will produce a hole in whatever you put in front of them. Need delicate 1mm–3mm holes in glass and beads? Use our Small Diamond Core Drills (1–3mm). Read on for more detailed information, technical specifications, including the approximate inner core diameters of each. ***Sold Individually ***
