【Material】- Drill bit set made of premium high speed steel, HRC 62-64 hard material with excellent hardness and wear resistance. Wood drill bit set with optimum cutting power, high durability and high abrasion resistance. Ideal hole size for #5, #6, #8, #10 or #12 screws. 【Standard 82° Angle】- These pilot-end screw countersink bits are designed to match 82° screws most commonly used woodworking chucks on the market. 【1/4'' Hex Shank】- The quick change chuck works with impact drills and other power tools. It perfectly meets all your daily needs. The product interface size is suitable for most household drills. Simple and easy to use woodworking kit. 【Multi-use】- Suitable for home or professional woodworking, used on wood, plastic, PVC, fiberboard, particleboard, plywood, rubber and more. Drill, countersink and counterbore in one step. This item comes with with 5 replacement bits. 【Quality Guaranteed】- All countersink drill bits are packed in a plastic case, which is easy to organize