Designed for optimal performance in welding applications, these contact tips from Miller Electric are specifically engineered for use with .040 to .045 inch aluminum wire. Each tip has a diameter of .312 inches and a length of 1.25 inches, ensuring a precise fit and reliable conductivity. Packaged in sets of 25, these tips are made in the USA and are an essential consumable for achieving high-quality welds in various welding projects. With their robust construction, they provide durability and efficiency, making them a valuable addition to any welding toolkit.