General description: This set of diamond tile drill bits includes 6 drill bits suitable for efficient drilling in materials such as tiles, glass, granite, and marble. The set contains a 6 mm yellow carbide drill bit (pre-drilled) and diamond drill bits of 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm. It is important to note that the yellow drill bit should only be used for pre-drilling and should not be subjected to prolonged use to avoid rapid wear. Technical specifications: Drill bits included: 5 mm, 6 mm, 8 mm, 10 mm, 12 mm; Pre-drilled bit: 6 mm yellow carbide; Drill type: blue diamond with cooling wax. Installation: First, install the yellow drill bit on the hand drill. Angle the drill bit at 45 degrees and rotate it quickly on the material surface. Then replace it with the blue diamond drill bit of the appropriate size for drilling. Usage: Add water during drilling to cool the drill bit and extend its lifespan. Use the blue diamond drill bit for fast and durable drilling. Other information: The diamond drill bit is compatible with many machines, including hand drills, angle grinders, and pillar drills. The blue diamond core drill bit contains a cooling wax that helps to automatically dissipate heat.