COLFULINE 4pcs M14 Diamond Drill Bit Set for Drilling with 20/35/50/68mm for Glass, Tiles, Granite, Porcelain - ShopVlot

Built-in cooling wash: inside the drill housing there is a cooling wax that plays a role of cooling and lubrication of the tip without the need for water, which contributes to cooling and prolonging the service life, saving time and efficiency (higher hardness materials require adding water before use) High-quality material: Made of high quality diamond, the vacuum soldering technology makes it very heat-resistant and durable, high hardness, sharp and durable Suitable for all types of materials: