External American UN full profile (UN, UNC, UNF, UNEF) laydown threading inserts. ER/L - ground periphery and rake, ERB - with a chipformer and peripherally ground, ERM - with a chipformer for general industry.
Internal American UN, Full Profile (UN, UNC, UNF, UNEF), laydown threading inserts. IR/L - Ground periphery and rake, IRB - with a chipformer and peripherally ground, IRM - With a chipformer. Application: general industry.