Engineered for high-performance welding, the Weldmark WMK24 Copper Slip-On Connection Bottleneck MIG Nozzle is an essential component for MIG guns rated up to 400 amps. This adjustable nozzle, made from durable formed copper, is designed to slide over the standard nozzle insulator, ensuring a secure fit and optimal contact tip relationship for precise welding applications. With a 5/8" bore diameter, it is particularly suited for air-cooled setups and is ideal for high-heat tasks where extended electrical stick-out is necessary, such as tack, spot, and stitch welding. Each package contains two nozzles, making it a practical choice for both professionals and hobbyists looking to enhance their welding efficiency and effectiveness.