Tile drill bit, Ceramic drill bit, Glass drill bit Small tools that make your work easier in a simple way. By rotating, precise positioning and easy drilling. Robust tungsten carbide drill bits Cemented carbide, which retains its strength and sharpness better than traditional steel bits, can pierce glass with ease. Universal hexagonal shank (1/4") Compatible with most drills/professional bits, easy to plug in and out, yet holds tightly. 6 Sizes 3mm, 4mm, 5mm, 6mm, 8mm, 10mm provide the right drill for the most common applications.