OSCARBIDE 3/8'' x 6''Indexable Boring Bar Overall Length with 10 Pieces CCMT21.51(CCMT060204) Right-Hand Sclcr Boring Bar: Amazon.com: Industrial & Scientific
FomaSP Carbide Inserts for Steel CCMT21.51 / CCMT060204 for Turning Cutting Tools, The chip Breaker"PM" fit for Semi-Finishing Metal Cutting, 10 PCS: Amazon.com: Industrial & Scientific