2 sizes, 1 in the bag: Black 6mm, 8mm. Easy to use, suitable for dry or wet drilling. You can work in any conditions. The perfect tools are at your fingertips. You too can do the same great job like a master! Multiple applications Ideal for porcelain, glass block, ceramic, tile, granite, marble, quartz, limestone, fiberglass terrazzo, masonry, quartzite and sandstone. Reasonable size for 6mm/8mm, thanks to the sharp and extremely hard diamond, the diamond drill bit ensures professional, clean and fast drilling. Thanks to the high-quality industrial diamond, the reamer has a fast cutting speed. High quality Thanks to the sintered diamond cutting heads and maximum precision, the cup wheels have a long service life. Sintering achieves high toughness, making the diamond material less susceptible to impact. It has particularly high strength and heat dissipation, thus extending its service life. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in