Premium Quality: Vacuum-brazed diamond technology offers very high efficiency, faster cuts, and longer life. Filled with cooling wax and suitable for dry drilling. Wide Application: For drilling glass, tile and hard ceramic tiles, porcelain, granite, marble, quartz, limestone, fiberglass, terrazzo, porcelain tiles, masonry, stoneware. Universal Shank: Designed with a 6.35 mm hex shank, suitable for the chucks of all standard drills and lightweight impact drills from Bosch, Hilti, Metabo, Makita, Milwaukee, and many others. Drill Bit Diameter: Ø6 mm, Ø8 mm, Ø10 mm, Ø12 mm Dry drilling or wet drilling for longer life. Note: Use with water when drilling granite. Special Features: 1) Cooling wax filling increases durability when dry drilling. 2) Although this is a wax core drill that can be used for dry drilling, when the wax core drill is exhausted, it can be cooled with water or coolant while drilling for longer life. Specifications: Diameter: 6mm, 8mm, 10mm and 12mm Hex shank: 6.35mm