General description These 16pcs Diamond Drill Bit Hole Saws are designed for precise drilling in hard and brittle materials such as glass, ceramics, marble, and porcelain tiles. Made with high-quality diamond, these drill bits ensure better drilling capacity and accuracy. Technical specifications Material: Diamond coated Sizes included: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm Usage To achieve optimal results, it is recommended to reduce the drilling speed and use water cooling to extend the life of the drill bits. Dry drilling is strictly prohibited. Other information Contents: 1 set of 16 diamond drill bits