Features: Versatile Countersink Drill Bit Set: This set includes good-quality countersink bits designed for wood, particle board, plywood, and aluminum boards, ensuring smooth and precise drilling for various materials. The hexagonal shank provides a secure grip in electric drills. Wear-Resistant Countersink Bits: Made from durable materials, these countersink bits resist wear and tear, delivering long-lasting performance. Ideal for wooden planks, fiberboard, and aluminum parts, they ensure clean, professional results every time. Hexagonal Shank For Stability: Featuring a hexagonal shank, these countersink bits prevent slipping in electric drills, providing better control and efficiency. Perfect for woodworking projects involving plywood, particle board, or aluminum panels. Multi-Material Compatibility: Suitable for wood, fiberboard, plywood, particle board, and aluminum parts, this countersink drill bit set offers versatility for various DIY and professional applications, ensuring perfect holes every time. Electric Drill Punching Tool Set: Designed for use with electric drills, this countersink bit set ensures quick and precise punching in wood, plywood, and aluminum. The hexagonal shank enhances stability, making it a must-have for woodworkers. Specifications: Material: Steel Length: 6.9cm, 6.6cm, 6cm, 5.6cm, 5.4cm Note: Due to the screen lighting effect, the actual color of the product may be slightly different. Due to manual measurement, please allow size error. Include: Choice1,3: 4*Drill Bits OR Choice2,4: 5*Drill Bits