FEATURES: 1）Upgrade Design-- Quickly restore threads to near original condition without the use of expensive thread-cutting equipment. 2）Easier Work-- From 1-1/4 inch to 5 inch O.D. Tighten the tool slightly on the good threads then back off over the damaged thread area to restore the threads. 3）Special Features-- Replaceable V-pads and dies. Complete with 6 Pcs No.216884 Standard dies threads per inch - 4 5 6 7 7-1/2 8 9 10 11 11-1/2 12 14 16 18 20 and 24. .