Pipe Thread Die, 2 1/2-4 In NPT, 4PcMfr #: 26192 SET OF 4 PIPE THREADR DIES: Includes 2 1 2" to 4" high speed NPT dies made for use with the RIDGID Model 1224 Threading Machine CUTS TAPERED OR STRAIGHT THREADS: High speed dies enable the cutting of tapered or straight NPT NPSM or BSPT BSPP threads for a wide variety of applications VERSATILE THREADING: Model 1224 threads a wide range of pipe including black, galvanized, and plastic coated pipe, stainless steel, IMC, and heavy duty wall