Helical Insert, UN 1 1/8-8X2.0D, PK10, Free Running, Material 304 Stainless, Length: 2.25″, Right Hand Thread Direction. STI Tap size: 1 1/8-8. Application for Metal; High-quality wire thread inserts strengthen thread and provide for longer thread life. These inserts can also be provided with full traceability and conformity certificates.