7-Piece Tile Drill Bit Set, Concrete Drill Bits, Diameters 3/4/5/6/8/10/12mm, 1/4" Diameter Tile Drill Bit, Spell Spear Head Drill Bit for Ceramic, Glass, Mirror, and Marble Tiles

[High-Quality Material] Made of hard alloy, this glass drill bit offers excellent abrasion resistance and extreme hardness for extended service life. The titanium-coated surface is anti-oxidant and will not discolor. [7 Sizes] Glass drill bit with 7 different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, all in a 1/4" hex shank, perfectly suited for various tasks. This drill bit is marked by size. [Precise and Smooth Hole] Excellent for drilling clean and precise holes in glass and tiles. The drill bit edge is thin, and the hole is smooth and complete, without leaving burrs. [Sturdy and Durable] Hex shank glass drill bits are sharp and change quickly. Using water lubrication will significantly extend the drill bit's lifespan. [Wide Application] Essential for DIY enthusiasts and home renovation projects, for drilling ceramic mirrors, glass tiles, and other hard and brittle work surfaces. Product Features: Made of carbide. Drilling is smooth and thorough, without shock, and easy to position. Low cutting resistance improves working speed and ease of use. Use for tiles, mirrors, and glass. These drill bits are specially designed for glass, ceramics, tiles, and any other hard and brittle work surface. Suitable for precise center drilling; they will not break porcelain. Caution: To improve the lifespan of the tile and glass drill bit, it is best to add a coolant, such as water, kerosene, or turpentine, during drilling. Use low speed and low pressure.