- Durability and Strength: Crafted from high-quality materials, these drill bits feature exceptional hardness and long-lasting durability, ensuring reliable performance over time. - 90 Degree Chamfer Cutter: This set includes six pieces of TiN-coated, 3-flute chamfer drill bits, with sizes ranging from 6.3mm to 20.5mm, ideal for creating precise chamfers and countersinks. - Compatibility: Designed for workpieces with a hardness of 25 degrees or lower. Perfect for various applications including aluminum sheets, thin iron plates, insulating boards, and PVC boards. - 100% Brand New: Each drill bit in this set is guaranteed to be brand new, ensuring you receive top-quality tools. Use Cases: 1. Create smooth, beveled edges on aluminum sheets for enhanced aesthetics and safety in DIY projects. 2. Efficiently countersink screws in thin iron plates, providing a flush finish that can prevent snagging and improve overall appearance. 3. Perfect for finishing insulating boards and PVC, allowing for seamless assembly in construction or repair tasks.