Dorian Tool E10S-SCLPR-2, 5/8" Diameter Carbide Boring Bar, Thru Coolant, Right Hand, With -5-Degree Lead Angle, For CP_-21.5_ Inserts, With 0.74" Minimum Bore and 10" Overall Length, MPN: 59651, 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