YG-1 Blue Ring Taps: High Performance Taps for ALL Ferrous Materials - Featuring Proprietary Hardslick Coating - Outstanding Performance in Titanium, Stainless, Cast Iron, Steel & Nickel-Based Alloys - No Need to stock 3-4 Series of Taps to cover the full range of Aerospace materials. - If it's Ferrous... Blue Ring taps it BEST!!! Why Blue Ring Taps? - YG's Hardslick Coating provides a low coefficient of friction, reduces torque and stress on the tap, and efficient chip evacuation Improves thread finish, Minimizes galling - Made of Advanced Cobalt Grade Powdered Metal Material - Blue Ring Taps technology provides High Heat Resistance for less wear, and Superior Toughness – less breakage 302A ANSI Dimensions Thread Standard: UNF