Material: Our glass ceramic tile drill bits are made of YG8 hard alloy. 4 cutting edges cross the spear head with hex shank, so that the drill is tighter and the hole is not easy to slip. High hardness, surface treatment against rust, long service life. Wide Application: This carbide bits is compatible with many types of machines such as ordinary hand drills, bench drills and rechargeable drills and other models, suitable for ceramic tiles, concrete, tiles, to brick, wood, plastic, glass, masonry, etc. add water or coolant when drilling. 5 Different Sizes: Includes 5 glass ceramic tile drill bits in 5 different sizes: 3 mm, 4 mm, 5 mm, 6 mm, 8 mm. Light weight and small size, suitable for your different needs. DIY Tool: Small incision resistance, stable drilling function, fast speed, not breaking the border, the tile drill bit is ideal for drilling fixing holes in bathroom tiles or wall mirrors.