Features: ✔【Advanced Materials】Diamond bits are made of high-quality alloy materials, which are durable and have a long life, high quality and good performance. They are very suitable for cleaning and drilling. ✔【Ideal application】This diamond-coated bit is very suitable for drilling glass, porcelain bottles, block jars, glass fiber ceramic tiles, marble slate, granite pumice, etc. ✔【Various sizes】The package includes different sizes ✔【Perfect Cut】Diamond drill bits can be used with only lubricating water, and can be used with standard electric drills. for Sharp and smooth cutting-The surface of the diamond saw blade is plated with high-quality diamonds, which can form a high-precision, smooth cut without folding edges. ✔【Glass drill bit】High-quality hole pitch drill bit set, reducing drilling pressure and increasing the use of water lubrication will greatly extend the service life of the drill bit. Specifications: Material: Metal Height: 125mm/4.92inch Package Includes: 1 Set Diamond Drill Bits note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you place order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!