S-STUCR/STFCR 6-2 Indexable Boring Bar ~ 0-Degree lead angle for boring and profiling. ~ 7° Relief ~ Shank is 0.375″. ~ Minimum Bore is 0.500″. ~ Overall length is 6″. ~ Uses Insert # TCMT-21.51. ~ Screw size is M2.5 X 6. ~ Torx wrench size is T-8. 0-Degree lead angle for boring and profiling. 7° Relief Shank is 0.375″. Minimum Bore is 0.500″. Overall length is 6″. Uses Insert # TCMT-21.51. Screw size is M2.5 X 6.