A Tool Kit to Work Cleanly, Quickly, And Easily! Widely used for metalwork, engineering, tool making, model engineering, jewelry making, wood carving, welding, chamfering, casting, deburring, grinding, cylinder head porting, and sculpting. Easy to use, safe, and reliable; Reduces the arduous manual labor greatly, and reduces the cost of production. MAIN FEATURES ✔️ VERSATILE: Widely used for metalwork, welding, wood carving, model engineering, jewelry making, deburring, grinding, cylinder head porting, and sculpting. ✔️ DURABLE: Made of heat-treated Tungsten carbide YG8 that lasts 10 times the working life than HSS, suitable for machining various kinds of metal material including ≤HRC65 hardened steel. ✔️ GOOD QUALITY: Good processing quality, high finish. Can be processed into a variety of high-precision shape mold cavity. ✔️ EASY TO USE: Suitable for all-electric and cordless drills. These durable, long-lasting rotary drill bits will bring excellent processing results to your tools. ✔️USERS: Suitable for all skill levels. This is an essential kit for woodworkers & enthusiasts who clean up welds or work with metal frequently, is easy to grasp and use, safe, and reliable. SPECIFICATION