General description 5pcs Countersink Drill Bit Set is designed for both home and professional woodworking projects. This versatile set allows for drilling, countersinking, and counter drilling in one operation, making it an essential tool for various materials including wood, plastic, PVC, fiberboard, chipboard, plywood, and rubber. Technical specifications Material: High-quality high-speed steel Hardness: HRC 62-64 Standard angle: 82° Hex shank size: 1/4'' Includes: 5 replacement bits Compatibility and accessories Compatible with most household drills Works with impact drills and other power tools Usage Optimal for screws No. 5, No. 6, No. 8, No. 10, or No. 12 Simple and easy to use woodworking kit