KATO Pro-Kits are the world's first Tangless MRO / thread repair kit designed for professionals. KATO Pro-Kits are ideal for mechanics, maintenance departments, original equipment manufacturers, machine shops, restoration shops and prototype fabricators. KATO Pro-Kits pack include (10) 304 stainless steel free running inserts. Damaged threads can be brought back to the original thread size and made better than new. Thread wear, corrosion and galling will be virtually eliminated. Assembly will be even stronger than the original. KATO Pro-Kits contain everything needed to get the job done from start to finish.