The ColumPRO 5PCS Cobalt 5-Flute Countersink Drill Bit Set is your go-to solution for creating precise countersinks on a variety of materials. Constructed from high-quality M35 cobalt high-speed steel, these bits offer exceptional durability and performance, even on tough metals like stainless steel and copper. The 5-flute design ensures quick and efficient chip removal, reducing clogging and providing smooth, accurate chamfers. Each bit features a tri-flat shank, ensuring a stronger grip in your drill chuck and preventing slippage during use. This added stability allows you to tackle more demanding tasks with ease and confidence. The set includes 5 SAE sizes (3/4", 5/8", 1/2", 3/8", and 1/4") with an 82-degree chamfer, offering versatility for a range of applications. Perfect for machinists, contractors, and DIY enthusiasts, this countersink bit set will help you achieve professional-grade results. The bits are housed in a convenient, CNC-machined case, making storage and transport simple and organized. Whether you're working on wood, metal, plastic, or fiberboard, this set is the ideal choice for all your chamfering and drilling needs.