Thread Chaser Number of Dies in Set 3 For Outside Dia 1-1/4 in to 5 in Capacity 1-1/4 in to 5 in Outer Diameter Function Restore Threads to Original Condition Eliminating the Need for Threadcutting Equipment For Use With Standard Thread Chaser Includes (3) Dies 1 mm-1.25 mm-1.5 mm-1.75 mm 2 mm-2.5 mm-3.0 mm-3.5 mm 4 mm pitch dies.