Made of high-quality materials, durable. The drill is made of heat-treated and tempered carbon steel, which provides excellent cutting force and durability, with higher accuracy than ordinary drills. The countersunk head has an automatic starting point, and the five-slot design reduces chatter and vibration, ensuring smooth operation for clean, accurate, and burr-free cutting. You can drill the screw hole and counterbore of the nut at the same time, keeping both on the same axis. After tightening the nut, it sits below the surface of the workpiece. The standard 1/4-inch hex handle allows for quick replacement, and the depth of the second sleeve can be adjusted using a flat-head screw with a hex key or deeper cover. Ejects wood chips faster, resulting in a smooth surface on various materials such as hard woods, cork, or aluminum. Suitable for workpieces with hardness below 25HRC, including carbon steel, thin iron plates, insulating plates, PVC boards, and wood boards.Color: Black + Silver Material: Carbon steel Size: Countersunk drills: 5 / 6 / 8 / 10 / 12 Package Contents: 4 x Claw corkscrews 4 x Barrel cork drills 5 x Countersunk drills 1 x Wrench Only the above package content is included; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.