- Versatile Size Options: This diamond drill bit set includes 5 dry core drill bits in various sizes: 2 3/16 inch (5 mm), 1 1/4 inch (6 mm), 1 5/16 inch (8 mm), 1 3/8 inch (10 mm), and 1 1/2 inch (12 mm). Perfect for a range of drilling tasks. - Advanced Dry Drilling Design: Mgtgbao drill bits feature an integrated wax lubricant that melts and cools the cutting surface during dry drilling, enhancing performance and longevity. For added cooling, water can also be utilized. The surface plating provides effective rust resistance. - Diverse Material Compatibility: This dry drill set excels at drilling through hard materials, making it ideal for ceramic tiles, porcelain, granite, glass, mirrors, marble, and masonry. Note: Not suitable for wood applications. - Universal Compatibility: Designed with a round shank, these black diamond drill bits are compatible with most machines, including manual drills, angle grinders, and bench drills. They also feature side grooves for efficient debris removal, promoting quicker drilling, and depth marks for precise measurements. - Convenient Storage: After use, store the diamond bits in the included gray box, ensuring they remain protected and organized for next time. Use scenarios: 1. Perfect for home renovation projects where drilling into tiles or stone is required. 2. Ideal for professional builders and contractors needing reliable tools for masonry work. 3. Great for DIY enthusiasts working on decorative glass and mirror installations.