Variety of Sizes Includes 10 sizes from 3 mm to 10 mm to cover a range of hole requirements for your projects. This ensures you have the right size for different screws and materials. Wide Application Designed for drilling soft materials such as wood, plastic and similar substrates. Suitable for a variety of DIY, hobby and light professional projects. Versatile Tool Combines drill and countersink in one tool, enabling drilling, chamfering, deburring and countersinking in a single operation. This helps improve hole quality and reduces setup time. Material Drill bit made from carbon steel and the countersink from 45# steel, chosen for durability and long service life. Applications Furniture assembly: drill pilot holes in wood and countersink for flat head screws to sit flush and look clean. Plastic components: create clean holes with beveled edges to reduce stress and improve fit. General woodworking and plastic projects: deburr edges and chamfer holes to finish parts more neatly and help with assembly.