RIDGID 26192 Threading Machine Dies, Right-Handed High-Speed Pipe Dies with Pipe Capacity of 2-1/2-Inches to 4-Inches for RIDGID Model 1224 Dies for RIDGID 1224 Threading Machine Threading dies have capacity of 2-1/2-inch to 4-inch (62-100 mm) RIDGID 26192 are High-Speed Dies Right-Hand, NPT (National (American) Pipe Tapered) thread, NPSM threads are made with NPT dies by adjusting the die head. See manual for details. Fit includes RIDGID Die Head 711 and 714