【Material】- The drill bit set is made of high-quality high-speed steel, HRC 62-64 hard material, with excellent hardness and good wear resistance. The wood drill bit set features optimal cutting power, high durability, and high wear resistance. Ideal hole size for #5, #6, #8, #10, or #12 screws.【82° Standard Angle】- These countersink bits for guide screws are designed to match the most commonly used 82° wood screws on the market.【1/4'' Hex Shank】- The quick-change chuck can be used with impact drills and other power tools. It perfectly meets all your daily needs. The product interface size is suitable for most household drill bits. Simple and easy to use woodworking kit. 【Multi-purpose】- Suitable for home or professional carpentry, used on wood, plastic, PVC, fiberboard, particleboard, plywood, rubber and more. Drill, countersink and chamfer in one step. This product comes with 5 replacement drill bits.