1. Efficient Drilling These drill bits are made of high-quality YG6X alloy for increased hardness. The oxynitriding process further strengthens the drill, making it more wear-resistant and durable. With full grinding and anti-rust treatment, the drill bits are clean, smooth, and burr-free. 2. Smooth and Accurate Fully automated polishing ensures uniformity and reduces incision resistance while drilling, resulting in stable and fast drilling speed without edge breakage. The bits create neat and smooth openings without any burrs or tremors, making chip removal easy. 3. Versatile Use Designed for professional use, these drill bits are suitable for drilling into ceramic tiles, marble, thin iron plates, mirrors, and glass. Remember to use water or coolant when drilling for better results. The set includes five different sizes to cover various drilling needs. Common applications include drilling holes in ceramic tiles and marble for bathroom or kitchen renovations, drilling glass or mirrors for fixtures, and drilling through thin iron plates for metalwork. 4. High-Quality Material Crafted with cemented carbide, these drill bits offer durability and long-lasting performance. The colorful design adds a touch of style to your drilling tasks. 5. Wide Compatibility These drill bits can be used with hand drills and bench drills, providing versatility and convenience for different drilling tasks. Get the job done efficiently with this multifunctional cross alloy drill bit set. 6. Note The actual product color may vary from the picture.