Engineered for high-performance welding, the Weldmark MIG Contact Tips are designed specifically for 400 amp MIG guns, ensuring optimal electrical conductivity and durability. These tips feature a unique threaded connection type, which guarantees a secure fit with the gas diffuser, while their thick-walled diffuser design effectively dissipates heat away from the arc source, enhancing overall welding efficiency. Crafted from a high-quality copper alloy, these contact tips boast excellent electrical properties and are marked for easy identification, allowing for quick and precise setup. Ideal for standard welding applications, they provide a reliable solution that extends the life of your welding equipment while maintaining the integrity of your welds.