Feature:1. Made of good-quality high-speed steel, with good anti-rust performance, and maximize the service life2. Possess higher hardness and sharpness, good drilling and chip removal performance, high sharpness, and strong piercing ability3. Easy to separate, spot welding cutting machine drill bit can easily separate the spot welding panel without distorting the sheet metal4. 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, cooperate with the rotation of the electric tool to remove the solder joint5. Used for common metal plates such as stainless steel plate, square tube iron plate, cast iron, glass fiber reinforced plastic, etc. Specification:Item Type: Spot Weld Cutter SetMaterial: High speed steelDiameter of Handle: Approx. 8mm / 0.3inDescription: 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, cooperate with the rotation of the electric tool to remove the solder jointUsed for common metal plates such as stainless steel plate, square tube iron plate, cast iron, glass fiber reinforced plastic, etc. Package List:1 x Spot Welding Drill1 x Drill Bit5 x Spare Blade2 x Spare Screw