Description: 【Material】: Our Diamond Core Bit is made from industrial diamonds, ensuring exceptional durability and cutting performance. This drill bit can penetrate the toughest granite, marble, and ceramic tiles up to 20mm or 30mm in thickness. 【Versatile Use】: This M14 Diamond Drill Bit is for drill through a variety of materials, including concrete, brick, porcelain, ceramic tiles, granite, and more. Whether you're working on a construction project or a home renovation, this tool is have for and efficient drill. 【Optimized Design】: The Diamond Core Bit features a hollow center design for easy removal of drill dust, reducing friction and heat during the drill process. This not only extends the bit's lifespan but also enhances drill speed and precision. 【Easy to Install】: This M14 drill bit is designed for quick wet drill into stone and ceramic tiles. It's ideal for use with high speed angle grinders. It's easy to install and remove, saving your time and effort. 【 Segmented Design】: The diamond drill bit features a segmented design, ensuring sharp and efficient drilling. Specification: Material: Diamond Size Chart: Inner Diameter:  Total Length 3.2cm/1.26inch: 10.4cm/4.09inch 3.5cm/1.38inch: 10.4cm/4.09inch Package Includes: 1 Piece Diamond Drill Bit   Note: Please allow slightly errors 1-2cm differences due to manual measurement.