Drill bits are commonly used cutting tools in metalworking, woodworking, and construction, used to drill holes in a variety of materials. Based on their structure and function, they are primarily categorized into twist drills, center drills, deep hole drills, step drills, and diamond drills. Twist drills are suitable for general metal and wood drilling; center drills are used for precise positioning; deep hole drills specialize in drilling holes with high depth ratios; step drills can form multiple diameter holes in a single operation; and diamond drill bits are designed for hard and brittle materials like glass and ceramic tile. Drill bits are often manufactured from high-speed steel, cemented carbide, or diamond coatings, ensuring a balance of hardness, wear resistance, and impact resistance, ensuring drilling efficiency, accuracy, and a long service life.