1. FAST AND EFFICIENT DRILLING: The four-blade-cross design enables rapid drilling, reducing the time and effort required to complete your projects. The eccentric shape allows for better control and stability during drilling, reducing the risks of slipping and ensuring accurate hole placement. 2. CLEAN AND SMOOTH HOLES: This drill bit's unique design minimizes splintering and produces clean, smooth holes in various materials. It can help achieve results with a polished finish in many cases. 3. VERSATILE USE: These drill bits are suitable for various materials, including wood, plastic, concrete, brick, marble, glass, ceramic, and metal. They offer versatility needed for a wide range of projects. 4. ENHANCED DURABILITY: The material provides increased hardness and resistance to wear to withstand heavy-duty use, helping these drill bits maintain their sharpness and performance over time. The spiral-groove design clears particles quickly and decreases friction and heat for a fast and cooler drilling performance. 5. COMPATIBLE TOOLS: The set includes 7 commonly used drilling sizes (3/4/5/6/8/10/12mm) to meet your needs. 6. Notice: 1. Actual color may be slightly different from the image due to different light effect. 2. Please allow 1-3cm deviation due to manual measurement. 7. Specification: 7pcs (3/4/5/6/8/10/12mm) 8. Package List: 7pcs Concrete Drill Bit Set