Experience enhanced welding performance with the Weldmark MIG contact tips, designed specifically for 250, 300, and 400 amp MIG guns. These tips feature a threaded style that ensures optimal contact with the gas diffuser, enhancing electrical conductivity and prolonging the life of your welding equipment. Crafted from high-quality copper alloy, they provide a smooth interior surface for consistent performance, while the thick-walled diffuser design acts as a heat sink, effectively managing heat away from the arc source. With easy identification markings for part number and wire diameter, these contact tips are engineered for reliability and efficiency, making them an essential consumable for any welding professional.