Made of materials, durable_x000D__x000D_The drill is made of heat-treated and tempeRed carbon steel, which has cutting strength and durability, and its accuracy is higher than that of ordinary drills._x000D__x000D_The countersunk head has an automatic starting point, and the five-slot design eliminates chatter and vibration, and makes the operation smooth, thereby achieving clean, accurate and burr cutting._x000D__x000D_You can drill the screw hole and counterbore of the nut at the same time, and keep the two on the same axis. After tightening the nut, the nut is located on the plane of the circuit board._x000D__x000D_The standard 1/4-inch hex handle can be quickly replaced, and the depth of the second sleeve can be adjusted by covering the matching plug with a flat-head screw head Hex key or a cover._x000D__x000D_Eject wood chips faster, you can get a smooth surface on any type of hard, cork or aluminum._x000D__x000D_Suitable for workpieces with hardness lower than 25HRC, such as carbon steel, thin iron plate, insulating plate, PVC plate, wood board, etc._x000D__x000D_Color:Black+Silver_x000D__x000D_Material:Carbon steel_x000D__x000D_Size: countersunk drills: 5#/6#/8#/10#/12#_x000D__x000D_Package Contents:_x000D__x000D_4 x claw corkscrews_x000D__x000D_4 x barrel cork drills_x000D__x000D_5 x countersunk drills_x000D__x000D_1 x wrench_x000D__x000D__x000D__x000D_