1. This diamond milling bit is made with a new - type brazing process. It features firm welding, high diamond density, and is hard, keen , and not prone to detachment. It enables efficient drilling and is less likely to slip. 2. This product is highly durable and has an extended service life, allowing you to drill holes smoothly without any deviation.3. It is suitable for grinding various materials such as porcelain, ceramic tile, marble and something made of stone. By combining a standard core bit with this finger shaped bit, you can effortlessly produce holes of multiple sizes.4. Note: Regularly check for wear, store it safely after cleaning, and make sure operators are professional and wear protective gear.