Dorian Tool E08R-SNR-H11, 1/2" Diameter Carbide Threading Bar, Thru Coolant, Right Hand, For 11IR Inserts, With 0.59" Minimum Bore and 8" Overall Length, MPN: 59939, 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