Precision Threading: These pipe threading dies are ideal for NPT 1/2 to 3/4-inch threads, processing a wide range of pipes. Please check compatibility with your equipment before purchase High-Quality Material: Made from durable HSS (high-speed steel) with high hardness, toughness, wear resistance, and heat tolerance, these metal threading dies maintain stable performance in high-demand environments, reducing downtime and replacement costs. Wide Compatibility: These NPT pipe dies are compatible with RIDGID universal die heads and VEVOR split-type machines, including models like RIDGID 504A, 711, 713, 811A, 815A, 816, 817, and 842, providing flexibility and reducing equipment costs. Precision Cutting: Sharp and evenly spaced cutters ensure no metal shavings, improving thread accuracy and quality for leak-free connections with pipe threading dies. Easy to Replace: No complex steps—just insert the replacement dies for pipe threading into the threading machine following the numbered sequence, making it quick and easy to boost production efficiency.