This tap and die set is made of made of high carbon chromium bearing steel which are more stronger, An overall chromium coating improves the corrosion resistance of the generally used through-hardening bearing steel. 86 piece tungsten steel set comes in an organized, rugged plastic storage case. Ideal for rethreading fasteners and fastener holes for auto and machinery repair. Perfect set for the professional craftsman. Tap and die set is designed to thread cutting: tap is used to process internal thread, while the die is for external thread.Known for their ability to start easily, these taps and dies are the most commonly used style and are perfect for most hand threading applications. This item is in the category "Home & Garden\Tools & Workshop Equipment\Hand Tools\Taps & Dies". The seller is "lev_460652" and is located in this country: US. This item can be shipped to United States.