Patented Split Rethreading dies are used by mechanics, homeowners, gunsmiths, car guys, military armorers, or anyone who has a need to repair damaged threads. These dies are available from 1/4-20 to 1-14, and metric from 5 mm-.80 to 24 mm-3.00. We also have a variety of specialized dies for gunsmith and armorer requirements. You can purchase individual dies, or a variety of sets depending on your needs. We can also custom make any die you require in 4 to 6 weeks. If you are a mechanic who works on automobiles, diesel engines, boats, motorcycles, atv's, this product should be in your tool box. There is a short video available on our web site which will help explain the benefits of owning a set of your Split Rethreading Dies. All of our dies are now Black Oxide coated for corrosion resistance. Our products are proudly made in the Heartland, in Ohio, and this company is owned by a Vietnam SDV Veteran. We will be happy to serve your needs.