The die cast alloy V-pad will not damage the threads. V-pads and dies can be replaced when worn out. Capacity: from 1 1/4" to 5" O.D. . Thread chaser, complete with 6 dies: threads per inch, 4, 5, 6, 7, 71/2, 8, 9, 1 0, 11, 11 1/2, 12, 14, 16, 18, 20,24 .  Weight: 2 lbs., 13 oz. Precision dies restore threads to their original condition to make reassembly of matching parts faster and easier. Eliminates the need for expensive thread-cutting equipment. Tighten the tool slightly on the good threads, then back off over the damaged thread area to restore the threads.