Designed for high-performance welding applications, these MIG contact tips from Weldmark by Tweco are crafted to enhance your welding experience. With a bore diameter of 0.045 inches and compatibility with 250, 300, and 400 amp MIG guns, these standard threaded tips ensure a secure connection with gas diffusers, minimizing the risk of contact issues during operation. Constructed from durable copper alloy, the thick-walled diffuser design not only acts as a heat sink to dissipate heat efficiently but also promotes excellent electrical conductivity, ultimately doubling the lifespan of the tips. Each contact tip is clearly marked for easy identification, allowing for quick and hassle-free replacements, ensuring that you maintain the quality of your welds while maximizing the longevity of your equipment.