K3 M10 Contact Tips All Kemppi’s original M10 contact tips are precision-drilled, high quality consumables. The high-speed drilling produces a much smoother borehole surface, which enables smooth and reliable wire feed and extends contact tip lifetime.  Each filler wire diameter includes three clearance classes: C1 = Small –> Fe C2 = Medium –> Ss C3 = Large –> Al Large class is the best choice for spray arc welding (high power). Small class is better for short arc welding (low power). Small class offers also accuracy for precise arc ignition. LIFE+ contact tips last up to 5 times longer than ordinary copper tips, reducing overall costs and increasing welding time. Each filler wire diameter includes three clearance classes: C1, C2, C3. Just select the class that is the most suitable for your application. If you experience trouble in high-power welding, you might try selecting a bigger clearance class. A smaller clearance class may have a positive effect on ignition. K3 M10 Contact Tips

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