✔️【Premium Carbide-Tipped Construction】Crafted from high-grade carbide, this eccentric drill bit is hardened and precision-ground to an exceptionally sharp edge. This process ensures smooth, burr-free drilling with reduced resistance, delivering superior wear resistance and long-lasting durability for consistent performance drill after drill. ✔️【Eccentric Design Prevents Slippage】The innovative crooked head design is the ultimate solution for preventing bit walk and skidding on hard, smooth surfaces. It locks securely into the starting point, enabling clean, accurate, and crack-free holes in tile and glass from the very first second. ✔️【Optimized for High-Strength Performance】Engineered as a high-strength eccentric twist drill bit, it handles the toughest materials with ease. For optimal results when drilling glazed ceramics or thick glass, we recommend using water for cooling to extend bit life and achieve a cleaner cut. ✔️【Wide Compatibility Across Materials】Achieve professional results across a vast range of materials. This versatile bit effortlessly penetrates ceramic tile, glass, brick, hard plastic, and cement concrete. It is an essential tool for contractors, technicians, and DIY enthusiasts tackling diverse projects. ✔️【Secure Hex Shank & Practical Size】The reliable 3pcs 1/4 "(6mm),3pcs 5/16" (8mm),2pcs 3/8 "(10mm), and 2pcs 1/2" (12mm) is the most versatile size for countless tasks, from installing fixtures to plumbing work. The standard hex shank ensures a tight, non-slip grip in all compatible drill chucks, providing maximum torque transfer and safety. This 10-Pack offers exceptional value, ensuring you always have a spare on hand. HUHAO High Strength Eccentric Drill Bit Set 10PCS High Speed Steel Masonry Concrete Bit Set for Stone Glass Marble Tile Wood,(1/4",5/16",3/8",1/2")