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.