【material】- Drill bit set made of high-quality high-speed steel, hard material HRC 62-64 with excellent hardness and good wear resistance. Wood drill bit set with optimal cutting performance, high durability and high abrasion resistance. Hole with ideal size for screws No. 5, No. 6, No. 8, No. 10 or No. 12. 【standard angle of 82°】These countersink bits for leading end screws are designed to fit the most commonly used 82° carpentry screws on the market. 【1/4'' hex shaft】- Quick change chuck works with impact drills and other power tools. It perfectly meets all your daily needs. The size of the product interface is suitable for most household drills. Simple and easy to use woodworking kit. 【Versatile】- Suitable for home or professional woodworking, used on wood, plastic, PVC, fiberboard, chipboard, plywood, rubber and more. Drilling, countersinking and counter drilling in one operation. This item comes with 5 replacement bits.