Engineered for performance and durability, these MIG contact tips from Weldmark by Tweco are designed to enhance your welding experience. Compatible with 250, 300, and 400 amp MIG guns, they feature a standard threaded connection that ensures a secure fit with the gas diffuser, optimizing electrical conductivity and prolonging the life of the tip. Crafted from high-quality copper alloy, these tips boast excellent electrical properties and a precise inside diameter tolerance, which significantly improves the welding process by increasing the electrical conductive surface area. With easy identification markings for part number and wire diameter, these tips are a reliable choice for heavy-duty applications, ensuring consistent results every time you weld.