The Universal Pipe Threading Dies are designed for use with our NPT Pipe Threading Die Head w/ Micro-Adjust (49165100). Our pipe threading dies are offered in alloy, high speed, and high speed for stainless. Each die type is available in sizes 12.7 mm - 19 mm ( ½ - ¾”) and 25 mm 50 mm (1” – 2”). These dies are also compatible with Ridgid Universal Die Heads (NOS. 504A, 711, 713, 811A, 815A, 816, 817, and 842). Stamped size, type, and alignment numbers for easy identification and installation.