PREMIUM QUALITY: These 55mm diamond drill bits are constructed from durable diamond and carbon steel, offering excellent wear resistance and rust protection for long-lasting performance. INNOVATIVE DESIGN: It is featuring side slots that facilitate cooling water entry and efficient debris removal from the borehole, ensuring smoother and faster drilling. SMOOTH CUTTING: The high-quality diamond coating ensures precise, smooth cuts with no rough edges, making the drilling process easier and more efficient. VERSATILE APPLICATIONS: Perfect for drilling ceramic, marble tile, stone, glass, and other hard materials, making these bits suitable for various tasks. IMPORTANT USAGE TIP: To prevent damage, maintain a drilling speed of 800-1000 RPM and continuously add water to keep the bit cool. Dry drilling is strictly prohibited., Weight: 0.0 Pounds, Manufacturer: Dapetz