Dorian Tool E20U-SWLCR-4, 1 1/4" Diameter Carbide Boring Bar, Thru Coolant, Right Hand, With -5-Degree Lead Angle, For WC_-43_ Inserts, With 1.53" Minimum Bore and 14" Overall Length, MPN: 60055, 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