AccusizeTools - 3/8'' x 6'' RH SCLCR Indexable Boring Bar with CCMT Insert, P252-S401 Shank Diameter: 3/8'', Overall Length: 6'', Min. Bore: 0.468'', Insert CCMT 21.51 & Key Included, Positive 80 degree diamond CCMT inserts, Negative 5 degree end & side cutting angle Boring from light roughing to finishing in small bores, Profiling bar for semi-finishing and Extreme fine gloss finish Bar hardness approximately 45HRC