Designed for high-performance welding applications, these MIG contact tips from Weldmark by Tweco are engineered to deliver exceptional electrical conductivity and durability. Crafted from a copper alloy, each tip features a machined inside diameter that ensures a consistent surface for optimal performance, effectively doubling the lifespan of the tip. With compatibility for MIG guns rated at 250, 300, and 400 amps, these heavy-duty contact tips are ideal for solid wire types and are equipped with a threaded connection that guarantees secure contact with the gas diffuser. Easy to identify and replace, the tips are marked for wire diameter and can be easily adjusted to expose new wear points, making them a reliable choice for professionals seeking to maintain the quality of their welds.