Dorian Tool E16R-ADNER-3, 1" Diameter JetStream Thru Coolant Carbide Threading Bar, Right Hand, For Top-Notch NG-3L Inserts, With 1.38" Minimum Bore and 8" Overall Length, MPN: 60173, Features 6xDiameter Boring Ratio (8xDiameter under favorable conditions), Thru-Coolant, 1/2 (12mm) or larger bars have threaded ends for easy coolant connection, Precision ground solid carbide body for high rigidity in deep hole boring, Brazed head is heat treated to 40-44HRC and precision machined to accept standard inserts