Construction and durability: The drill bit is made from carbon steel and the countersink from 45 steel, delivering extended service life and reliable performance even with frequent use. Multipurpose tool: This drill and countersink combination handles drilling, chamfering, deburring, and countersinking, making it a versatile essential for woodworking and metalworking tasks. Size options: Available in 10 sizes ranging from 3 mm to 10 mm, providing flexible options to match specific project needs and maximize versatility. Efficient and smooth operation: The fiveflute design minimizes chip volume and accelerates chip removal, enabling quicker, smoother operation and reducing clogging risks during use. Practical use scenarios: Woodworking: drill pilot holes and countersink for flushfitting wood screws in furniture, cabinetry, or decorative projects. Metalworking: deburr and chamfer drilled holes on sheet metal or metal components to ensure clean edges and proper fastener seating. General assembly: prepare holes in various materials for a neat, professional finish with reduced risk of splintering or rough edges.