Features: Durable: Drill bits and spot welding drills are made of high-speed steel, which can quickly drill holes and remove metal materials from solder joints. Precise: The special tip design provides precise precision when drilling the surface. Multi-function: The drill bit with approximately 3 inches hexagon shank is for the standard quick-change serration sleeve, thus providing the versatility required for drilling. Convenience: The length of each drill bit is 1-2 inches, and short-angle and right-angle drill bits can be used to work in hard-to-reach narrow spaces. Set contains: The 9-piece drill bit includes a twist drill, an electric welding drill, two spot welding drill bits and 4 serrated sets. Purpose: Use the center point to fix the solder joint and press it down (there is a spring device on the back of the nail to expand and contract). When the serration touches the solder joint surface, it can be rotated with the power tool to remove the solder joint. Specifications: ●Material:High Speed Steel ●Color ：Black ●Spot welding drill: 74mm; Twist drill: 78mm ●Spot welding drill 32mm ;Serrated sleeve :15mm ●Shank diameter :6.35mm Cutting diameter :9.5mm Package Includes: 1xPoint Drill Tool note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.