Robustness and Longevity - Crafted with precision from high-quality materials, countersink drill bit set boasts sharpness and robustness, minimizing cutting resistance, ensuring reliability for your woodworking endeavors. Versatile Application - 82-degree tip drills countersink holes for wood, plastic, metal and composite materials. Cannot work on stainless steel. This countersink drill bit excels in deburring, chamfering, and countersinking tasks across a variety of woodworking projects. For optimal countersinking results, please ensure to create a pilot hole with a tap beforehand. Multiple Sizes - The countersink drill bits set includes 5 sizes: 1/4, 3/8, 1/2, 5/8, 3/4 inch, Including a Bit Holder and a plastic Storage Toolbox, allowing you to choose the appropriate size for your specific project needs. Enhanced Efficiency - With 5 flute design, countersink drill bits ensure efficient debris removal, resulting in smoother and cleaner countersinking（ensuring screws and fasteners sit