Quickly restore threads to near original condition without the use of expensive thread-cutting equipment. 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. 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.Metric pitches 1/0 1.25 1.5 1.75 2.0 2.5 3.0 3.5mm Superior Material — Advanced CNC machined aircraft grade billet aluminum with silver anodized finish, good rigidity, durability and anti-corrosion. High precision and hardness to provide a much longer service life. This thread chaser will quickly restore threads to near original condition without the use of expensive thread-cutting equipment. Just tighten the tool slightly on the good threads, and then back off over the damaged thread area to restore the threads. Easy to Use: This external thread repair tool kit is suitable for from 1‑1/4 inch to 5 inch OD, just tighten the tool slightly on the good threads, then back off over the damaged thread area to restore the threads.