These pipe threading dies are ideal for NPT 2-1/2 to 4-inch threads, processing a wide range of pipes. Please check compatibility with your equipment before purchase Made from 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. These NPT pipe dies are designed for integrated pipe threading machines, ensuring an ideal fit and reducing replacement costs. and evenly spaced cutters no metal shavings, improving thread accuracy and quality for leak-free connections with pipe threading dies. 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. Color: Silver Material: High Speed Steel Package Contents: 4 x threading machine Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.