Enhance your drilling tasks with this premium 15-piece Drill Bits Set, crafted from high-quality high-speed steel with a nitrogen-treated surface for exceptional hardness, wear resistance, and long-lasting durability. Designed to deliver strong drilling power, these bits are perfect for a variety of materials including wood, plastics, and metal, making them an essential addition to your DIY, home improvement, or professional toolkit. Key Features: · Premium High-Speed Steel Construction: Made from fine-quality high-speed steel with a nitrogen-treated surface, these drill bits offer superior hardness and excellent wear resistance for extended tool life and reliable performance. · 1/4 Inch (6.35mm) Straight Shank Design: Ensures easy and secure insertion into drill jigs or drill presses, providing stable operation and convenient installation. · Complete 15-Piece Set with Multiple Sizes: Includes 5 drill bits each of 3mm, 4mm, and 5mm sizes, allowing you to select the perfect bit for various drilling needs with precision and versatility. · Spiral Groove Design: Optimizes chip removal, reduces friction and heat buildup, and enhances drilling efficiency for smoother, faster, and cleaner holes. · Wide Application Range: Suitable for drilling through wood, plastics, metal, and other materials, ideal for DIY woodworking, home use, general construction, and engineering projects. Specifications: · Material: High-Speed Steel with Nitrogen-Treated Surface · Shank Diameter: 1/4 inch (6.35mm) · Drill Bit Sizes and Lengths: - 3.0mm: 82mm length - 4.0mm: 94mm length - 5.0mm: 104mm length · Package Size: 130 x 80 x 50mm (5.12 x 3.15 x 1.97 inches) · Package Weight: 180g (6.35 ounces) Package Includes: · 15 x Drill Bits (5 pieces each of 3mm, 4mm, and 5mm sizes) This Drill Bits Set combines durability, precision, and versatility to meet all your drilling requirements efficiently. Whether you are working on woodworking projects, home repairs, or professional engineering tasks, these high-speed steel bits provide consistent performance and excellent results every time.