- High-Quality Carbon Steel Construction: Our spiral wood drill bits are expertly crafted from premium high carbon steel, offering greater durability and a lighter weight compared to standard solid spiral drills. The hardening treatment enhances their longevity, ensuring they withstand rigorous use. - Innovative Four-Groove Design: Each bit features a four-blade and four-groove configuration for seamless drilling. This design not only facilitates efficient chip removal but also includes a screw tip for pinpoint accuracy when starting holes. The anti-slip hexagonal handle allows for quick and secure changes, making them compatible with both hand drills and electric drills. - Comprehensive Size Set: This set includes 8 distinct sizes: 9/23 inch (10mm), 9/19 inch (12mm), 5/9 inch (14mm), 7/11 inch (16mm), 5/7 inch (18mm), 11/14 inch (20mm), 13/15 inch (22mm), and 63/64 inch (25mm). This extensive variety caters to all your drilling needs across different diameters. - Versatile Applications: Ideal for woodworking projects, these drill bits work efficiently on various materials, including hardwoods, cork, and plastics. They ensure precision and high performance whether you're crafting furniture, creating crafts, or conducting repairs at home. - User Tips: For optimal results, apply firm pressure when using an electric drill to prevent any unwanted movement during the drilling process. Choose our spiral wood drill bits for reliability, precision, and versatility in all your drilling tasks.