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 SAE TAP SIZES:1/8"-27NPT, 4-40, 6-32, 8-32, 10-32, 10-24, 12-24, 1/4"-20, 1/4"-28, 5/16"-18, 5/16-24, 3/8"-16,3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18. SAE DIE SIZES:1/8"-27NPT, 4-40, 6-32, 8-32, 10-32, 10-24, 12-24, 1/4"-20, 1/4"-28, 5/16"-18, 5/16-24, 3/8"-16,3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18. METRIC TAP SIZES M3-0.5, M 4-0.7, M 5-0.8, M 6-1.0, M 7-1.0, M 8-1.0, M 8-1.25, M 9-1.25, M 10-1.5, M 10-1.25, M 11-1.5, M 11-1.25, M 12-1.75, M 12-1.5, M 14-2, M 14-1.5, M 16-2, M16-1.5 METRIC DIE SIZES M 3-0.5, M 4-0.7, M 5-0.8, M 6-1.0, M 7-1.0, M 8-1.0, M 8-1.25, M 9-1.25, M 10-1.5, M 10-1.25, M 11-1.5, M 11-1.25, M 12-1.75, M 12-1.5, M 14-2, M 14-1.5, M 16-2, M16-1.5 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. 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.