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-Advantages : Simple Structure, Easy to Mount; Strong and Durable , With Long Service Life- 100% Brand New and High Quality MIG Torch Contact Tips.-Package Includes : 20 Pieces M6*28*1.2MM MIG Welding Contact TipsCopper or Copper Alloy: Contact tips are typically made from copper or copper alloys. Copper is an excellent conductor of electricity, which ensures efficient transmission of electrical current from the welding torch to the wire, enabling the arc for welding.Plated Finish (Optional): Some contact tips may have a coating (such as chromium or nickel) to improve wear resistance and extend their lifespan, especially in high-heat environments.Wire Feeding: The contact tip is responsible for guiding the welding wire from the wire feeder through the MIG torch and into the weld puddle. Its internal diameter closely matches the diameter of the welding wire (1.2mm in this case), ensuring smooth and precise wire feeding.Electrical Conductivity:The contact tip’s primary role is to transfer the electrical current from the welding torch to the wire, generating the arc that melts the wire and base material to create the weld. Copper's high conductivity ensures a stable arc and smooth wire feeding.Wire Guidance:The 1.2mm bore diameter provides a precise guide for the welding wire. This ensures consistent and smooth wire feeding during welding, minimizing disruptions like wire jamming or burn-back.Heat Resistance:Contact tips are exposed to intense heat during the welding process. The copper alloy construction ensures that the tip can withstand high temperatures without degrading quickly, providing longevity under normal welding conditions.Wear Resistance:With prolonged use, contact tips experience wear due to the constant friction from the wire and the high heat of the welding arc. Quality M6 contact tips are designed to last through multiple cycles of use, though they are consumables and will eventually need replacement.Compatibility:The M6*28mm contact tip is compatible with most MIG welding torches that use M6 threading. The 1.2mm bore size makes it suitable for use with 1.2mm welding wires, commonly used in heavier welding tasks such as in automotive repair, construction, and metal fabrication.