5-piece set of high-speed steel step drills: This set of five standard step drills is made of high-speed steel. Unlike traditional types, Vila drill bits have 6 or more sizes per drill bit. In fact, it can replace 50 individual drill bits and handle holes of up to 50 diameters. Efficient and fast: Despite different diameters, the groove characteristics of the drill bit remain consistent. The process of removing the drill bit during drilling is not necessary. Its titanium coating also helps reduce friction and heat, thereby accelerating speed. Suitable for various materials and applications: This tool can create holes and penetrate various types of materials, such as laminates, plastics, plywood, granular wood, acrylic acid, and thin metal plates. You can also use it for different DIY and light work projects. Sturdy aluminum storage box: enclosed in a durable and exquisite aluminum casing, ensuring that your drill bit is properly protected when not in use. This also helps to extend its service life and does not make it look dull quickly.