Name: 6-3/4″ New Button Bit with 3-1/2 API Regular Pin and a Sealed Journal Bearing (IADC Code of 527)
SKU: TB63/4527FO

7-7/8″ New Button Bit with 4-1/2 API Regular Pin and a Sealed Journal Bearing (IADC Code: 417 or 517)

8-1/2″ New Button Bit with 4-1/2 API Regular Pin and a Sealed Journal Bearing (IADC Code: 517)